texture mud pump made in china

In the future, we will be more confident to provide better and more mud pump with outstanding operation performance, the best quality products, Cementing pump and services for the whole society and contribute to social stability and economic development.Our company is interpreting the belief of "quality makes the future" with its excellent Blue Mud Pump, appropriate application and considerate service. Our company has complete sets of production equipment, we have strong technical force and advanced production technology. We have rich experience in product manufacturing, and we are sure to be able to solve problems and needs for our customers. The company will continue to pursue the industry in depth to further promote the development of the industry. We have been providing the best value-added services with professional and personalized services to meet customers" needs. Through the application of innovative technology, we have effectively improved our production efficiency and have advantages in product quality control, scale operation and production cost control. With new theories, new ideas and new methods, we have formed a hiring mechanism to meet the needs of industrial development and a highly experienced and combatant staff team.

It is mainly used to supply flushing fluid to the drilling well in core drilling or hole drilling. The pump can discharge not only clear water, but also thick mud. And for the specialty of small external dimension, light weight, the pump is suitable for transportation in...

Centrifugal drilling mud pump is a mud pump with centrifugal function. The main features are high pressure, large head, low energy consumption and convenient operation. It is used for geophysical prospecting to provide flushing fluid to the borehole and to provide flushing...

​Mud pump piston extension rod is a connecting part that supports piston work. Most of it is used in oil cylinders and cylinder motion executive parts. It is a moving part with frequent movement and high technical requirements.

Yukos Petroleum Equipment is professional in offering various quality and low price f800 mud pump. We"re one of the leading China manufacturers and suppliers of various equipment in oil & gas industry, having introduced advanced equipment in our factory. Welcome to buy the...

We are able to providehigh quality mud pump with stable performance and affordable price , We focus on product manufacturing, we experience in this aspect , we want to be able to carry with you in China to establish a long-term relations of cooperation.

Mud pump Mud Pump Manufactures and Models include: EMSCO Mud Pumps F-350 | F-500 | F-650 | F-800 | F-1000| F-1300 | F-1600 | FB-1300 | FB-1600 Brewster Mud Pumps B-550 | B-750 | B-1000 | 1100T | B-1300 Continental Emsco Mud Pumps FF-FXF | FG-FXG (A thrugh L) | FD-FXX | FC-FXX...

Small mud pumps can withstand heavy loads and are specially designed for conveying highly abrasive or corrosive slurries and high-density slurries, and are widely used in metallurgy, mining, coal, power stations, seawater river dredging, building materials and other...

We can provide high quality mud pump for structure rugged and Stable performance, Our mud pumps are sold to many countries abroad, We focus on product manufacturing, we experience in this aspect , I hope you can become a good friend of the cooperation with us

The three cylinder piston mud pump is equipped with three cylinders with multiple levels of flow and pressure, which can well meet the needs of different bore diameters, hole depths or drilling processes.

 Piston and piston rod We can provide the piston assy and piston rod for F series,3NB series and other type of mud pump. Piston and piston rod are made of high hardness alloy steel,and they are wear-resistant , anti-corrosive and anti-distortion after heat treatment. The...

 wear-resistant mud pump piston rod for hydraulic cylinder 1.Premium quality 2.Heat treated alloy steel 3.The surface is Chrome plated 4.Polished to mirror-like finish 5.The rod is precisely made and treated with excellent abrasion and corrosion resistance We can provide the...

The color, texture and feel of this product are exactly the same as those described on the official website, so it is a trustworthy company. On the whole, this company is very good. I will continue

With the changes of the market, we will further improve the scientific and technological content of our 1000 Fracturing pump, overall dimensions for mud pump, Drilling fluid control products, and constantly introduce new products to meet the needs of our customers, so that our products and the progress of the society perfectly combined. Yukos Petroleum Equipment is professional in offering various quality and low price Blue Mud Pump. We"re one of the leading China manufacturers and suppliers of various equipment in oil & gas industry, having introduced advanced equipment in our factory. Welcome to buy the famous brands" bulk Blue Mud Pump in stock form us.

Material is 35CrMoA or 40CrMoNn alloy forged steel. To get better fiber texture, we use electric stove for second forging, or deoridation treatment. It is forged from three directions and the forging ratio is not less than 4.0:1.0. It can not have crack, impurity, looseness, overburns, etc. And weld is not allowed. It should be confirming to the stipulation of JB/TQ252-81, and should be checked by gradeⅢ After quenching the rough module will be rough processed, then the hull hardness is HB285-330.

Antigua and Barbuda, Aruba, Australia, Austria, Bahamas, Bahrain, Bangladesh, Barbados, Belgium, Belize, Bermuda, Bolivia, Brazil, Brunei Darussalam, Bulgaria, Cambodia, Canada, Cayman Islands, Chile, Colombia, Costa Rica, Cyprus, Czech Republic, Denmark, Dominica, Ecuador, Egypt, Estonia, Finland, France, French Guiana, Germany, Gibraltar, Greece, Grenada, Guadeloupe, Guatemala, Guernsey, Honduras, Hungary, Iceland, Indonesia, Ireland, Israel, Italy, Jamaica, Japan, Jersey, Jordan, Kuwait, Latvia, Liechtenstein, Lithuania, Luxembourg, Macau, Malaysia, Maldives, Malta, Martinique, Mexico, Monaco, Montserrat, Netherlands, New Zealand, Nicaragua, Norway, Oman, Pakistan, Panama, Paraguay, Peru, Philippines, Poland, Portugal, Qatar, Republic of Croatia, Reunion, Romania, Saint Kitts-Nevis, Saint Lucia, Saudi Arabia, Singapore, Slovakia, Slovenia, South Africa, South Korea, Spain, Sri Lanka, Sweden, Switzerland, Taiwan, Thailand, Trinidad and Tobago, Turks and Caicos Islands, United Arab Emirates, United Kingdom, United States, Vietnam

{"links":[{"url":"https://www.graco.com/us/en/contractor/solutions/articles/how-to-mix-drywall-mud-for-texture-spraying.html", "anchor_text":"How to Mix Drywall Mud for Texture Spraying"},{"url":"https://www.graco.com/us/en/contractor/products/drywall-finishing-interior-texture/interior-texture-sprayers.html", "anchor_text":"Interior Texture Sprayers"},{"url":"https://www.graco.com/us/en/contractor/products/drywall-finishing-interior-texture/drywall-finishing-tools-accessories.html", "anchor_text":"Drywall Finishing Tools & Accessories"}]}

GN SOLIDS CONTROL is centred around separation equipment: Centrifuge technology/ Shaker screens/ Solids Control (desander, desilters, mud tanks, etc)/ Waste Management (cuttings dryers, conveyors, inclined clarifiers, etc) / Transfer Pumps (centrifugal, shear, screw, etc) / Electrical controls. Much of the GN range of equipment has been rigorously tested by, and is used today by, some of the world’s oil & gas giants in the challenging conditions of offshore drilling; these products more than meet expectations. Hebei GN Solids Control Co., Ltd is a leading manufacturer based in China and USA GN has exported to over 70 countries and we are helping to build a world class brand for the separation industry. GN is the first API certified solids control equipment manufacturer from China.

An oil slanket pump is a type of oil slanket pumping different oils, and compressed air pushes at the same rate. It is a type of oil slanket pump that is used for pumping different oils and pressure pushes. The oil slanket pump is specially designed for use in oil- conveying, and with compressed air pushes, to maintain the oil flow rate of the choice.@@@@@

An oil sl texture pump is also called a pistonumatic compressor pump, which is a compressed piston oil sl texture pump at the same time as a piston oil sl texture pump, or at the same time as a piston oil sl texture pump. The piston oil sl texture pump is also called a pistonumatic compressor pump, and in the form of a compressed piston oil sl texture, it is designed to clean and distribute water evenly through the pistonumatic compressor pump, and at the same time as a piston oil sl texture pump. A piston oil sl texture pump is also called a piston oil compressor pump, for it is low in pressure, and by compressed piston oil, in the form of a compressed piston oil, or when the compressed piston oil is released by the pumping process.

Explore a wide variety of dredge pump with cutter on Alibaba.com and enjoy exquisite deals. The machines help maintain drilling mud circulation throughout the project. There are many models and brands available, each with outstanding value. These dredge pump with cutter are efficient, durable, and completely waterproof. They are designed to lift water and mud with efficiency without using much energy or taking a lot of space.

The primary advantage of these dredge pump with cutter is that they can raise water from greater depths. With the fast-changing technology, purchase machines that come with the best technology for optimum results. They should be well adapted to the overall configuration of the installation to perform various operations. Hence, quality products are needed for more efficiency and enjoyment of the machines" full life expectancy.

Alibaba.com offers a wide selection of products with innovative features. The products are designed for a wide range of flow rates that differ by brand. They provide cost-effective options catering to different consumer needs. When choosing the right dredge pump with cutter for the drilling project, consider factors such as size, shape, and machine cost. More powerful tools are needed when dealing with large projects such as agriculture or irrigation.

Alibaba.com provides a wide range of dredge pump with cutter to suit different tastes and budgets. The site has a large assortment of products from major suppliers on the market. The products are made of durable materials to avoid corrosion and premature wear during operations. The range of products and brands on the site assures quality and good value for money.

BW Series Mud Pumps are mainly used for supplying flushing fluid to the borehole in core, geothermal, water resource, shallow oil, CBM and other drilling process. The fluid can be divided into mud, water, etc. They also can be used as transfer pumps of the above-mentioned medium. This series of mud pumps are with simple structure and easy to maintain and operate. Piston, lip-shaped and self-sealing type, is made of rubber or PTFE and nylon pads, equipped with shock-resistant pressure gauge, necessary spare parts and special tools. Bi-metal liner can be used to extend service life of pump greatly.

NBB Series Mud pumps are mainly used for the core, coal geology, metallurgy geology, hydrogeology engineering hole drilling fluid is supplied, flushing fluid can be divided into mud, water, etc., may be used as the above medium pump.

The mud pump is crank structure, horizontal triplex single acting piston pump, the piston is self-sealing lip, made of rubber or PTFE and nylon protective pads pressed, the pump adopts auto gearbox, variable five kinds of flow, the pump is compact, high efficiency, durable, safe, reliable, easy maintenance, low maintenance costs.

ZB Series grouting pumps are mainly used for kinds of weak corrosivity viscous and nonviscous liquid grouting(such as water, mud), especially for vertical shaft working face grouting, goaf filling, coal mine water inrush governance and so on.

The pump is triplex single-acting plunger high pressure pump, fitted with international first-class gearbox, which is of features like compact structure, multistage speed regulation, realizing different flow rate and pressure, meeting the grouting requirements of different formation. Electric motor drives triplex pump through transmission system. It has many advantages, like convenient adjustment for pressure and flow rate, long service life and so on.

3NB & 5NB Series Mud Pumps are mainly used for oil, water well, geothermy, CBM, shale gas, coalfield exploration, freezing well as well as well other drilling ,well cementation, work-over and other operations in industrial and mining enterprises. It is used for transferring mud, clay gum, mortar and other medium to the borehole. The pump adopts international advanced technology. It is characterized by advanced structure, reliable operation, good suction performance, long service life of wearing parts, easy for maintenance and repairing and so on.

F Series Mud Pumps are mainly used in oil field and geological prospecting for well drilling, well work-over, cementing, water shut off, water flooding and sending mud, clay, grout and so on.

The piston is one of the parts that most easily become worn out and experience failure in mud pumps for well drilling. By imitating the body surface morphology of the dung beetle, this paper proposed a new type (BW-160) of mud pump piston that had a dimpled shape in the regular layout on the piston leather cup surface and carried out a performance test on the self-built test rig. Firstly, the influence of different dimple diameters on the service life of the piston was analyzed. Secondly, the analysis of the influence of the dimple central included angle on the service life of the piston under the same dimple area density was obtained. Thirdly, the wear of the new type of piston under the same wear time was analyzed. The experimental results indicated that the service life of the piston with dimples on the surface was longer than that of L-Standard pistons, and the maximum increase in the value of service life was 92.06%. Finally, the Workbench module of the software ANSYS was used to discuss the wear-resisting mechanism of the new type of piston.

The mud pump is the “heart” of the drilling system [1]. It has been found that about 80% of mud pump failures are caused by piston wear. Wear is the primary cause of mud pump piston failure, and improving the wear-resisting performance of the piston-cylinder friction pair has become the key factor to improve the service life of piston.

Most of the researchers mainly improve the service life of piston through structural design, shape selection, and material usage [1, 2]. However, the structure of mud pump piston has been essentially fixed. The service life of piston is improved by increasing piston parts and changing the structures of the pistons. However, the methods have many disadvantages, for example, complicating the entire structure, making piston installation and change difficult, increasing production and processing costs, and so on. All piston leather cup lips use rubber materials, and the material of the root part of the piston leather cup is nylon or fabric; many factors restrict piston service life by changing piston materials [3]. Improving the component wear resistance through surface texturing has been extensively applied in engineering. Under multiple lubricating conditions, Etsion has studied the wear performance of the laser surface texturing of end face seal and reciprocating automotive components [4–6]. Ren et al. have researched the surface functional structure from the biomimetic perspective for many years and pointed out that a nonsmooth surface structure could improve the wear resistance property of a friction pair [7, 8]. Our group has investigated the service life and wear resistance of the striped mud pump piston, and the optimal structure parameters of the bionic strip piston have improved piston service life by 81.5% [9]. Wu et al. have exploited an internal combustion engine piston skirt with a dimpled surface, and the bionic piston has showed a 90% decrease in the average wear mass loss in contrast with the standard piston [10]. Gao et al. have developed bionic drills using bionic nonsmooth theory. Compared with the ordinary drills, the bionic drills have showed a 44% increase in drilling rate and a 74% improvement in service life [11]. The present researches indicate that microstructures, like superficial dimples and stripes, contribute to constituting dynamic pressure to improve the surface load-carrying capacity and the wear resistance of the friction pair [12–21].

In nature, insects have developed the excellent wear-resistant property in the span of billions of years. For instance, the partial body surface of the dung beetle shows an irregularly dimpled textured surface with the excellent wear-resistant property that is conducive to its living environment [7, 8, 22]. The dung beetle, which is constantly active in the soil, shows a body surface dimple structure that offers superior drag reduction. These dimples effectively reduce the contact area between the body surface and the soil. Moreover, the friction force is reduced. Therefore, the dung beetle with the nonsmooth structure provides the inspiration to design the bionic mud pump piston. This paper proposed a new type of piston with dimpled morphology on its surface and conducted a comparative and experimental study of different surface dimpled shapes, thus opening up a new potential to improve the service life of the mud pump piston.

A closed-loop circulatory system was used in the test rig, which was built according to the national standard with specific test requirements. The test rig consisted of triplex single-acting mud pump, mud tank, in-and-out pipeline, reducer valve, flow meter, pressure gauge, and its principle, as shown in Figure 1. Both the pressure and working stroke of the BW-160 mud pump are smaller than those of the large-scale mud pump, but their operating principles, structures, and working processes are identical. Therefore, the test selected a relatively small BW-160 triplex single-acting mud pump piston as a research object, and the test results and conclusion were applicable to large-scale mud pump pistons. The cylinder diameter, working stroke, reciprocating motion velocity of piston, maximum flow quantity, and working pressure of the BW-160 triplex single-acting mud pump were 70 mm, 70 mm, 130 times/min, 160 L/min, and 0.8–1.2 MPa, respectively.

The mud pump used in the test consisted of water, bentonite (meeting the API standard), and quartz sand with a diameter of 0.3–0.5 mm according to actual working conditions. The specific gravity of the prepared mud was 1.306, and its sediment concentration was 2.13%. Whether mud leakage existed at the venthole in the tail of the cylinder liner of the mud pump was taken as the standard of piston failure. Observation was made every other half an hour during the test process. It was judged that the piston in the cylinder failed when mud leaked continuously; its service life was recorded, and then it was replaced with the new test piston and cylinder liner. The BW-160 mud pump is a triplex single-acting mud pump. The wear test of three pistons could be simultaneously conducted.

The mud pump piston used in the test consisted of a steel core, leather cup, pressing plate, and clamp spring. The leather cup consisted of the lip part of polyurethane rubber and the root part of nylon; the outer diameter on the front end of the piston was 73 mm, and the outer diameter of the piston tail was 70 mm, as shown in Figure 2. We proceeded in two parts during the design of the dimpled layout pattern because the piston leather cup consisted of two parts whose materials were different. The dimples at the lip part of the leather cup adopted an isosceles triangle layout pattern, and the dimples at the root part were arranged at the central part of its axial length, as shown in Figure 3(a). Dimple diameter (D, D′), distance (L), depth (h), and central included angle (α) are shown in Figure 3. The dimples on the piston surface were processed by the CNC machining center. Since then, the residual debris inside the dimples was cleaned.

Table 1 shows that average service lives of L-Standard, L-D1, L-D2, and L-D3 were 54.67 h, 57.17 h, 76.83 h, and 87.83 h, respectively. Therefore, the mud pump pistons with dimples provide longer service life than the L-Standard piston. As the dimple diameter increases, the piston service life was improved, and the largest percentage increase of the service life was 60.65%. The service life of the L-D4 piston was about 81.17 h, which increased by 7.94% compared with that of the L-D2 piston, indicating that the piston with dimples at the leather cup root could improve piston service life.

Figure 4 illustrates the surface wear patterns of pistons with different dimple diameters in the service life test. Figures 4(a) and 4(a′) show wear patterns on the surface of the L-Standard piston. This figure shows that intensive scratches existed in parallel arrangement on the piston leather cup surface, enabling high-pressure mud to move along the scratches from one end of the piston to the other easily, which accelerated the abrasive wear failure with the abrasive particles of the piston. Figures 4(b), 4(b′), 4(c), 4(c′), 4(d), and 4(d′) show the wear patterns of the leather cup surfaces of L-D1, L-D2, and L-D3 pistons, respectively. Figures 4(b), 4(b′), 4(c), 4(c′), 4(d), and 4(d′) show that the scratches on the leather cup surface became shallower and sparser and the surface wear patterns improved more obviously as the dimple diameter increased. If the piston leather cup surface strength was not affected to an extent as the dimple diameter increased, the reduced wear zone near the dimple would become greater and greater, indicating that the existence of dimples changed the lubricating status of the leather cup surface, their influence on nearby dimpled parts was more obvious, and they played active roles in improving the service life of the piston.

Figure 5 displays the wear patterns of the leather cup root parts of the L-D4 and L-D2 test pistons. The wear patterns of the nylon root parts of the L-D4 pistons are fewer than those of the L-D2 pistons, as shown in Figure 5. When the leather cup squeezed out high-pressure mud as driven by the piston steel core, it experienced radial squeezing while experiencing axial wear. Therefore, the area with the most serious wear was the piston leather cup root part, and the friction force at the leather cup root was much greater than that at the other areas. The rapid wear at the root decreased the piston load-carrying capacity and then affected the service life of piston. The dimples at the piston leather cup root could reduce the wear of the piston leather cup root and improve the service life of piston.

Figure 6 shows the surface wear patterns of the L-S1 and L-S2 test pistons. In Figures 6(a) and 6(a′), the scratches on the piston leather cup surface became sparse and shallow in the dimpled area. Figures 6(b) and 6(b′) show that the wear was slight in the area close to the dimples. The farther the scratches were from the dimpled area, the denser and deeper the scratches would be. The L-S1 piston had a small dimple central included angle, which was arranged more closely on the piston surface. The lubricating effects of oil storage in each row of dimples were overlaid very well, which was equivalent to amplifying the effect of each row of dimples in Figure 6(b), making the wear on the whole piston leather cup surface slight, preventing the entry of high-pressure mud into the frictional interface, and lengthening the service life of piston.

During the operation of the mud pump piston, the outside surface of the piston leather cup comes in contact with the inner wall of the cylinder liner and simultaneously moves to push the mud. The lip part of the piston leather cup mainly participated in the piston wear and exerted a sealing effect, while the piston root part mainly exerted centralizing and transitional effects. In the mud discharge stroke, the lip part of the piston experienced a “centripetal effect,” and a gap was generated between the lip part and the cylinder liner. The greater the contact pressure between the lip part and cylinder liner of the piston was, the smaller the gap was, and the entry of high-pressure mud into the contact surface between the piston and cylinder liner was more difficult. The piston root easily experienced squeezing under high pressure, and the smaller the equivalent stress caused by the piston root was, the more difficult the squeezing to occur. Hence, the contact pressure at the lip part of the piston and the equivalent stress at the root were analyzed, and they would provide a theoretical basis for the piston wear-resisting mechanism. The ANSYS Workbench module was used to perform a comparative analysis between the contact pressure at the lip part and the equivalent stress at the root of the three kinds of pistons (i.e., L-Standard piston, L-S1 piston, and L-D1 piston). The service life of the L-S1 piston exhibited the best improvement effect, whereas that of the L-D1 piston demonstrated the worst improvement effect. The piston adopted a 1 mm hexahedral grid, and the grid nodes and elements are as shown in Table 4.

The lubricating oil on the mud pump piston surface could reduce the wear of piston and cylinder liner and improve the service life of pistons with the reciprocating movement. The lubricating oil would eventually run off and lose lubricating effect, which would result in piston wear. The finite element fluid dynamics software CFX was used to establish the fluid domain model of the dimpled and L-Standard pistons and analyze the lubricating state on the piston surface. The piston surface streamlines are shown in Figure 10. This figure shows that the lubricating fluid did not experience truncation or backflow phenomenon when passing the surface of the L-Standard piston. When the lubricating fluid flowed through the surface of the dimpled piston, it presented a noncontinuous process. Its flow velocity at the dimpled structure slowed down obviously because it was blocked by the dimpled structure.

When the piston moved in the cylinder liner, a small quantity of solid particles in mud entered gap of piston and cylinder liner and participated in abrasion. The dimpled structure on the piston surface could store some abrasive particles (as shown in Figure 6(a′)) during the piston wear process to prevent these particles from scratching the piston and cylinder liner and generating gullies, thus avoiding secondary damage to the piston and cylinder liner and improving the piston service life.

This paper presented a dimpled-shape mud pump piston; that is, the piston leather cup surface had a dimpled array morphology in regular arrangement. The experimental results can provide the basic data for design engineering of the mud pump piston with a long service life. The comparative analyses of service life and wear patterns for dimpled mud pump pistons and L-Standard pistons were conducted. The main results and conclusions were summarized as follows:(1)The service life of the mud pump piston with dimpled morphology on the surface improved in comparison with that of the L-Standard piston, and the service life increase percentages were from 4.57% to 92.06%.(2)The piston service life would increase with the dimple diameter under the same dimpled arrangement pattern, and the maximum increase in the value of service life was 60.65%.(3)The service life of the piston with dimples increased by 7.94% in comparison with that with none.(4)Under the same dimpled arrangement patterns and area densities, the tighter and closer the dimples were arranged on the piston surface, the longer the service life of piston was, and the maximum increase in the value of service life was 92.06%.(5)Under the same wear time, the wear of the dimpled piston slightly decreased in comparison with that of the L-Standard piston, and the minimum value of wear mass percentage was 3.83%.(6)The dimpled shape could not only change the stress state of the piston structure, improve piston wear resistance, and reduce root squeezing, but also increase oil storage space, improve lubricating conditions, and enable the accommodation of some abrasive particles. Furthermore, the dimpled shape was the key factor for the service life improvement of the mud pump piston.

A kind of surface has the mud piston of pit form to be made up of piston core 1, leather cup 2, pressing plate 3, snap ring 4, and wherein leather cup 2 is by nylon root-protecting ring 5 and 6 bonding compositions of lip rubber.Leather cup 2 is fixed on the piston core 1 through pressing plate 3 and snap ring 4.There is pit array on described mud piston leather cup 2 surfaces, and the pit array area accounts for 10%～25% of piston cup 2 surface areas, and the longitudinal section of pit can be rectangle or circular arc.The pit array on its leather cup 2 surfaces can be an one-step die casting, also can be employed in the method for processing preparation once more of leather cup surface.

Described mud piston is near excessively apart from the piston lip by avoiding being added pit, and causes piston lip mud when entad bending takes place directly to rush in frictional interface, causes piston wear serious.So lip rubber 6 surfaces add the pit form and should keep a segment distance apart from the leather cup lip, this distance is generally 1.5～2 times of pit diameter a, and is as shown in Figure 3.

The present invention is applied to the drilling mud pump of recover petroleum, coal-seam gas, petroliferous shale, underground water etc., and installing/dismounting is identical with conventional piston, does not have special usage requirement.

Built slurry pump easily damaged parts test stand in key lab of the bionical ministry of education of Jilin University"s engineering, mud piston of the present invention has been carried out stand test, to investigate using effect of the present invention.Data are following:

Life test is carried out on homemade bw-160 slurry pump; Piston external diameter: 70mm; The slurry pump pump speed: 200 dash/minute; Mud balance: 1.135; The mud sand content is about 1%; Slurry pump pump pressure: 0.7～1.1MPa.

Under same test conditions, normal optical slip stock pump piston and the mud piston that the surface has the pit form are carried out wear test respectively, up to 3 the every group complete wear out failures of piston.Used mud piston specifications parameter of the present invention is in the test: the pit array area accounts for 18% of piston cup 2 surface areas; The pit longitudinal section is a rectangle, and pit is arranged by not waiting number to misplace at the axial arranging of lip rubber 6, and pit diameter a is 4mm; Adjacent two pit centres spacing b are 6mm; Pit depth c is 3mm, and the angle d in center to the piston center of circle of adjacent two row"s pits is 12 °, and lip rubber 6 pit forms that the surface adds are 6.3mm apart from the distance of leather cup lip.Measure in test the quality before and after piston cup 2 test and write down each piston working life, obtain test data such as table 1～2.

Prove through comparative test result: the present invention can improve mud piston working life.Under aforesaid test conditions and piston specification, piston has improved about 2.3 times average life.