back pressure safety valve in stock

At right, Machine Shop Supervisor Peter Colantuono inspects the "new" RVT relief valve in PVC (at right in the photo), next to the previous design. The differences are really just cosmetic; the "tee" design and the "solid" body RVT have identical internals and performance. If you have any questions about the new look for the RVT, please call our Technical Group at 973-256-3000

For decades the RVT in PVC has been a hand-constructed valve based on a molded schedule 80 tee. We would modify the stock tee, then assemble and weld a number of parts within the tee to build the valve body. In materials such as PTFE, natural polypro and PVDF, the valve body was always machined out of solid stock. Although the two types of bodies looked markedly different, valve performance was identical.

Seal kits are identical for both designs. If you have both �tee� body valves and solid body valves installed, replacement springs and seal kits are completely interchangeable (within the same size, of course).

You should also be aware that some of the tee body valves are still in the channel � both in distributor stock and our factory stock. As a result, you may continue to see the tee valves in various sizes.

This corrosion-resistant valve is used as a bypass valve and is also a used for back pressure control applications such as maintaining constant pump discharge pressures, limiting pump overpressure and bypassing excessive pressures from various types of process equipment, and wherever a constant pressure must be maintained in a process or piping system. This back pressure valve can be used for corrosive or mildly corrosive fluids, only when the proper materials are selected and applied. When liquids or gases contain debris or other solid matter which might cause internal clogging or improper operation of the back pressure/bypass valve, a filter or strainer with a fine wire mesh (at least a #20 mesh) should be installed before the inlet of the valve. High-pressure in-line strainer fittings or simplex basket strainers can be purchased from Straval.

atmospheric pressure, except for normal piping losses. Where the outlet pressures in the discharge piping are elevated and stay elevated, re-seating of the valve will take place at a much lower pressure than the original set pressure. The valve will re-seat itself to its original set pressure once the outlet pressure is reduced to its original value when the valve was set. If this behavior is not acceptable, contact Straval for a balanced piston model, one that is designed to compensate for high outlet pressures.

Although the valve is typically installed in the position illustrated, it can operate in any position or orientation, vertical horizontal, etc as long as it can be easily accessed for making adjustments.

Do not oversize a back pressure valve simply because the piping is already oversized, unless it has a reduced trim option designed into it. Because very often this will result in "valve chatter" when the capacity for which the valve is designed for is too low. This is because an oversized valve seat for a very low flow rate barely opens to satisfy an overpressure condition, only to close again very quickly. This repeated action usually at very low flows, results in valve chatter and can eventually result in severe valve seat damage. This can often be corrected by replacing the piston with a reduced trim version to match the lower flow conditions that were not anticipated. Special custom trim can be designed to tolerate very low flows when these conditions are specified and such trim requested. This must be quoted on request.

Where an overpressure condition needs to be relieved quickly, such as for emergency relief, use the closely related high pressure relief valve (RVC05). Both models have the same maximum relieving capacity, except the BPS05 is designed to control the relief pressure more gradually at the lower capacities resulting in less of a chance for pressure spikes and possible valve chatter at low capacities. This make the BPS05 model more suitable for pump bypass service or for back pressure control than the RVC05.

These valves do not have carry the Canadian CRN or ASME approval stamp and should not be applied where this requirement must be met. However, the valves generally meet or exceed ASME design criteria with wall thicknesses that are much heavier than the minimums required. For an additional charge, valves can be ordered with material certs and with a certified hydro-test certificate and other tests to meet special documentation and acceptance requirements.

Designed to meet 3-A sanitary standards, these valves regulate liquid, gas, and air pressure in hygienic zones of food and beverage plants. They’re often used at the end of pipelines on processing and sanitizing equipment. Made of 316 stainless steel, they won"t corrode from frequent washdowns with harsh cleaners. With an extremely smooth interior that self-drains, bacteria won"t have time or space to grow. The spring and internal valve mechanisms are sealed off behind the diaphragm, which also prevents contamination. They connect with quick-clamp fittings, so disassembling to clean your line takes little time.

These valves obstruct flow to maintain sufficient operating pressure in your system. If the system pressure exceeds the set pressure, they exhaust through the outlet. They meet ANSI/FCI 70-2 Class III standards for shut-off valves, meaning a maximum of 0.1% of fluid, gas, or air will escape through the outlet when they’re closed. An integrated T-handle lets you set the outlet pressure without additional tools. The diaphragm and seal resist repeated exposure to water, and they’re FDA compliant for direct contact with food.

Back pressure valve / relief valve for fitting directly on the pump"s dosing head with the functions:Back pressure valve, opening pressure approx. 1.5 bar with free outlet or priming pressure at the suction end (black rotary dial)

The multifunctional valve is operated by free-moving rotary dials that automatically return to their original position when released by the operator. This means operation is possible even when access is difficult. The multifunctional valve is made of PVDF and can be used to meter almost any chemical.

Caution: Back pressure valves are not absolutely leak-tight shut-off devices! It is essential that you observe the installation notes in the operating instructions!

SealFKM and EPDM (loose)TypeRelief opening pressure *Connector sizeBypass connectorOrder no.*The relief opening pressure given above is the pressure at which the valve starts to open. The pressure may be up to 50% more than this before the valve is fully open depending on the type of pump.Size I16 bar6-126 x 4792011

Adjustable back pressure valve for fitting directly onto the dosing head to generate a constant back pressure. For accurate metering with a free outlet and with priming pressure on the suction side.

Please note: Back pressure valves are not absolutely leak-tight shut-off devices! It is essential that you observe the installation notes in the operating instructions!Applications:Metering pump alpha, beta, gamma/ X, gamma/XL, Pneumados b, EXTRONICTypeadjustable pressure max.Connector widthMaterialOrder no.

Adjustable back pressure valve for installation in the metering line to generate a constant back pressure for precise metering with a free outlet and with priming pressure on the suction side

When used as a back pressure valve in long lines to avoid resonance vibrations: Install at the end of the metering line or select a set pressure greater than the line pressure loss

Use in conjunction with pulsation damper only with a free outlet and short metering line. Use type DHV-U when using a pulsation damper with back pressure or long lines.

Please note: Back pressure valves are not absolutely leak-tight shut-off devices! It is essential that you observe the installation notes in the operating instructions!Applications:Metering pumps alpha, beta , gamma/ X, gamma/XL, Pneumados b, EXTRONICTypeadjustable pressure max.Connector widthMaterialOrder no.

Our Flanged Top Valves in Plastic incorporate 150# socket-welded flanges on PVC and CPVC valves, and threaded 150# companion flanges on polypropylene, PVDF, and PTFE valves.

This series includes a standard aluminum metallic top, viton diaphragm, and high pressure spring, with three standard choices of metallic wetted bottom

Our High Temperature series is designed for applications above 140°F / 60°C. Its features include:Temperature limit of this valve is dependent upon body material selection, to a maximum of 300°F (149°C)

Option body materials available are CPVC Corzan and PVDF, however these have limited pressure versus temperature ratings, and the factory should be consulted to ensure proper selection

Readily available stainless steel union-style connection for Top Valve ensures ease of installation and removal. Its features include:Available in 2 sizes, ranging from 1/4" to 1/2" NPT or BSPT.

This valve is used for back pressure control applications such as maintaining constant pump discharge pressures, bypassing excessive pressures from various types of process equipment, and wherever a constant pressure must be maintained in a process or piping system. Valve can be used for non-corrosive or mildly corrosive fluids, depending on the materials selected. When liquids or gases contain debris or other solid matter which might cause internal clogging or improper operation of the valve, a strainer with a fine wire mesh should be installed before the inlet of the valve. In-line strainer fittings or basket strainers can be purchased from Stra-Val. For gas or air service, a soft-seated version with Teflon or other engineering plastics is available to improve seating performance.

Baird Valve and Regulator L.L.C., the original manufacturer of the Back Pressure Regulator, offers a full line of 1”, 2” and 3” liquid and gas relief valves as well as a large stock of pump parts, cages, ball and seat testing machines and a variety of other oilfield related items.

Norriseal-Wellmark’s Back Pressure Valves can be used in any installation where upstream pressure is required to be kept at a preset range. Back pressure valves may also be used as: a pressure relief valve, a custody transfer dump valve to hold a certain back pressure, or as a separator back pressure valve on the gas or liquid side.

Ligao safety relief valve and back pressure valve help to relieve excess pressure on the pump system or maintain pressure at a setted point .Safety relief valve is installed on the outlet pipeline of metering pump. When the system pressure becomes abnormal, safety relief valve protects metering pump from any damages. Back pressure valve shall be installed at the outlet of metering pump in order to reduce siphon and excess feeding, and ensure the metering accuracy of metering pump is not affected, when dosing point is lower than the outlet of metering pump.