espresso safety valve free sample

Also called siphon, anti-siphon or vacuum breaker valve. This valve allows air to escape the boiler as the water heats up, hissing and then closing off when the boiler water reaches it"s operating temperature, sealed by the steam pressure created. Shop valves for La Marzocco, Simonelli, Astoria, and more.

The devil is in the details. It is often the smallest things, the particularities, that make all the difference. This is also the case in regards to the preparation of a good coffee, a ritual in which all the steps and every single component play a fundamental role. Among all, one of the most important elements is the Moka valve. Often ignored, it is vital not only for the quality of the coffee, but also for the safety of those who prepare it.

The valve was born with the invention of the Moka Express in 1933. It is a safety valve positioned on the bottom chamber. To better understand the importance of the valve and its use, we need to take a step back and illustrate step by step

This is where the valve of the Moka comes into play. It must open when the pressure is too high. By doing so, it allows the steam to escape regularly, without causing any damage. In short, the Moka’s safety valve provides security. Hence, it should only intervene when the coffee maker is used under abnormal operating conditions.

A long-standing and debated question: how far can you fill the bottom chamber for a state-of-the-art coffee? The Moka valve can come in handy to answer this dilemma. Another important role of the valve is that it acts as a "measuring cup". Its position on the bottom chamber is not accidental. Rather, it indicates to those who prepare the coffee the correct amount of water to use. The only exception is for some special coffee pots that are already equipped with a measuring cup. Ideally the water should reach just below the safety valve.

The Moka valve, therefore, is not a decoration or a mere design element. Rather, it is a very important component for the correct functioning of the coffee maker. It guarantees safety and plays a part in the making of an excellent coffee.

Consequently, it is necessary to keep it clean and maintain it regularly. For example, using tap water to make coffee brings with it the risk of limescale deposits obstructing the hole in the valve. The resulting danger is that it could get clogged.

We have seen that one can simply use hot water to clean the Moka valve. To avoid limescale obstructions, simply move the piston that comes out of the valve along its axis when washing it. To ensure the Moka functions correctly, it is recommended to repeat this checkup periodically.

A kit to upgrade the preexisting PID and safety valve in a Profitec Pro 700 Espresso Machine. The new Pro 700 PID allows the steam boiler to heat up to 272 degrees Fahrenheit. This means the steam boiler will be able to deliver steam power to rival the largest steam boilers.

A kit to upgrade the pre-existing PID and safety valve in an ECM Synchronika Espresso Machine. The new Synchronika PID allows the steam boiler to heat up to 272 degrees Fahrenheit. This means the steam boiler will be able to deliver steam power to rival the largest steam boilers.

Following the company’s rebranding designed to emphasize its beverage-focused strategy, the Dunkin’ espresso relaunch is one of the most transformative product initiatives in the brand’s recent history, including when the brand first launched espresso in 2003.

The invention has been developed primarily for use as a controlled boiler method, and apparatus of an espresso machine and will be described hereinafter with reference to this application. However, it will be appreciated that the invention is not limited to this particular field of use.

Known espresso machine control both the pressure and dose of water delivered in producing a shot of espresso coffee. It will be appreciated that the pressure is typically set to between nine and ten bar. The dose is typically about 30 mL, and is delivered in between twenty to forty seconds.

There is a need for an efficient method and apparatus for providing a dose having a regulated pressure and volume. There is also a need to provide an efficient method and apparatus for enabling an espresso machine water pumps to deliver a controlled low pressure pre-infusion.

According to an aspect of the invention there is provided a flow measurement apparatus for measuring a resultant flow delivered by a pump coupled to an over pressure valve, the apparatus comprising:a first flow meter for measuring feed flow to the pump;

According to an aspect of the invention there is provided an espresso machine comprising a flow measurement apparatus as herein disclosed, for measuring a shot dose delivered by a pump coupled to an over pressure valve. Preferably, the espresso machine further comprises a pump power modification module as herein disclosed, for providing pre-infusion.

According to an aspect of the invention there is provided an espresso machine comprising a pump power modification module as herein disclosed, for providing pre-infusion. Preferably, the espresso machine further comprises a flow measurement apparatus as herein disclosed, for measuring a shot dose delivered by a pump coupled to an over pressure valve.

Preferably, the pump power modification module can enable pressure profiling during an espresso production cycle. More preferably, the pressure profile can be preset or user configurable. Most preferably, the pressure profile can take the form of power-time profile indicative of electrical power delivered to a respective pump.

According to an aspect of the invention there is provided a method of flow measurement for measuring a resultant flow delivered by a pump coupled to an over pressure valve, the method comprising the steps of:(a) measuring, using a first flow meter, feed flow to the pump;

According to an aspect of the invention there is provided an espresso machine comprising a processor device adapted to perform a method of flow measurement as herein disclosed, for measuring a shot dose delivered by a pump coupled to an over pressure valve.

It will be appreciated that espresso machines are widely used in making drink beverages. While Espresso machines are available in commercial and private use ranges, they share similar working principles.

Shots of espresso are typically brewed by the pressurised penetration of hot water through densely-packed finely-ground coffee. This forced diffusion of water through coffee grounds, results in the production of espresso coffee. Quality, flavour and taste of any resultant espresso coffee are influenced by a plurality of factors, which include texture of the ground coffee, the intensity of ground coffee packing, and temperature and pressure of the water used. By maintaining these factors in appropriate proportions, it is possible to produce substantially consistent shots of espresso.

Pump based espresso machines rely, at least in part, upon the bar pressure of the pump to make a suitable espresso coffee. Referring to FIG. 1, these pump based coffee machines 100 can include: a water reservoir 110 (typically internal), shower head 122, and filter basket 124 (for holding the coffee grounds). A steam wand 130 and steam valve 132 may be included for frothing milk. A drip tray 140 is typically provided for collecting spillages and excess water. A series of user control inputs 150 can be provided for setting at least some of the parameters (or factors) associated with producing espresso coffee.

It will be appreciated that some espresso machines have an integrated coffee grinder 160. This can include a hopper 162 for feeding coffee beans to a grinder and an output 164 for filling the filter basket (when provided there below) with coffee grounds.

With water in the water reservoir, and the coffee grounds in the filter basket, water is heated and pumped to the shower head 122. Upon heated water reaching the shower head 122, a forced diffusion of water through coffee grounds in the filter basket occurs, resulting in the production of espresso coffee.

FIG. 2 shows an embodiment schematic for an espresso coffee machine 200. This coffee machine comprises a water reservoir 210, having a reed switch tank level sensor 212. Egress from the water reservoir includes passing though a filter 214, in fluid communications with two egress paths 216 and 218.

In this embodiment, a first egress path 216 is for communicating water from the reservoir 210 to a steam boiler 250. This egress path includes a protection filter 220 which communicates water to a pump 221 that supplies water at a pre-determined pressure. A safety relief valve 222 is included to limit the water pressure provided to the steam boiler 250. In the event of over pressure occurring on this fluid line, the relief valve provides water to the drip tray 240 using fluid line 224. By way of example, the pump 221 provides water with about three bar pressure to the steam boiler 250 (using fluid line 223). For steam system, the pump is supplied the water at approx. 3 bar to refill the boiler. The safety relief valve 222 is set to activate at a higher pressure, and is used for protection.

By way of example, the steam boiler 250 is used to convert water provided by fluid line 223 to steam. The boiler includes a heating element 252, a water level probe 256, a thermistor 257, a thermal fuse and thermostat 258; and vacuum breather valve 259. In this example, the steam boiler is a 0.80 litre boiler. By way of example only, this boiler 250 can be constructed from any one or more materials in a set comprising diecast-aluminium (preferably teflon-lined), stainless steel, or brass. The heating element 252 is preferably an immersed 1000 watt heater element. By way of example only, this heating element can be constructed from any one or more materials in a set comprising stainless steel and Incololy. It would be appreciated that the heater element can have alternative power ratings that are suitable for creating steam within the boiler. The water level probe 256 preferably uses three probes to monitor water level and is substantially comprised of stainless steel probes. By way of example only, the thermistor 257 has a maximum temperature rating of about 200 degrees Celsius.

By way of example, egress steam 272 from the steam boiler 250 is released from a ball valve 274 though a steam wand 276. Preferably, the ball valve has a maximum temperature rating of about 150 degrees Celsius, a nominal working pressure of about two bar and a maximum pressure rating of about eight bar. In this embodiment, a second water egress path 218 communicates water from the water tank 210 to a coffee boiler 260. This egress path includes a protection filter 230, a first flow meter 233 and a pump 234. The pump 234 further includes an over pressure (or safety relief) valve 235. This over pressure valve 235 is adapted to limit the water pressure provided to line 236, typically to between nine bar and ten bar. The over pressure valve 235 is typically set to a pressure set-point, typically about ten bar, such that when water pressure exceeds this set-point a portion of the water is fed back through a return line 237 to the reservoir 210, thereby maintaining a pressure set-point. The amount of water fed back through a return line 237 can be measured by a second flow meter 238. The main egress path 236 proceeds through the steam boiler 250 via a heat exchanger 254 and then to the coffee boiler 260.

By way of example, egress from the coffee boiler is used to provide hot water 282, via a needle valve 284, though a hot water wand 286. In this example, the needle valve 282 preferably has a maximum temperature rating of about 120 degrees Celsius and a working pressure of about fifteen bar.

It will be appreciated that vibration pumps typically produce around fifteen bar to eighteen bar unregulated pressure, which is typically considered too high for espresso extraction. To regulate the pressure, a fixed or variable over pressure valve can be installed. However, with such a valve installed, known method of measuring the dose includes having a flow meter located proximal to the shower head. It will be appreciated that any installation in the flow proximal to the shower head requires that the over pressure valve be suited to operation in a high temperature and a high pressure environment. The construction and operation of over-pressure valves will be discussed in more detail below.

In an embodiment, a pair of flow meters are used, the first flow meter 230 to measure the feed flow to the pump and the second flow meter 237 to measure return flow from an over pressure valve 235. In this arrangement, the resultant flow delivered to the coffee boiler 260 (and therefore to the shower head 296) can be calculated by subtracting the return flow from the feed flow. By calculating resultant flow over a time period of coffee production, a dose measure can be determined. It will be appreciated that this calculation can be performed in real time, and used to stop the pump when a suitable dose has been delivered through the shower head.

In an embodiment, a flow measurement apparatus, for measuring a resultant flow delivered by a pump coupled to an over pressure valve, the apparatus comprising:

Referring to FIG. 3, a method 300 of flow measurement for measuring a resultant flow delivered by a pump coupled to an over pressure valve, the method comprising the steps of:STEP 320: monitoring (or measuring), using a first flow meter, feed flow to the pump;

It will be appreciated that a power modification module can further enable pressure profiling during an espresso production cycle. A pressure profile can be preset or user configurable (using user interface 204). Pressure profiling can take the form of power-time profile indicative of electrical power delivered to a respective pump.

An over pressure Valve (OPV), also known as an expansion valve, can be used to regulate water flow pressure within an espresso machine. The regulate pressure can be fixed or adjusted. For an espresso machine, an over pressure valve can regulate pressure down to between nine bar to ten bar on many vibration pump based machines.

Referring to FIG. 4, an over pressure valve 400 comprises an ingress aperture 410 and an egress aperture 420. An over pressure aperture 430 is included for releasing water to substantially maintain a pressure set-point. A release seal 432, typically in the form of a ball, rubber pad on brass piston or similar, is biased to a closed position by a spring 434 (the tension on the spring can be adjusted 436) against an exit aperture 438. When pressure exceeds in the set-point, the release seal 432 opens allowing water to flow toward the over pressure aperture 430.

It will be appreciated that alternative over pressure valves are adapted to be fixed to a ‘T’ piece, wherein the ‘T’ piece defines an ingress aperture and an egress aperture. Flow rate capability is typically determined by the size of the over pressure valve.

The primary purpose of a safety valve is to protect life, property and the environment. Safety valves are designed to open and release excess pressure from vessels or equipment and then close again.

The function of safety valves differs depending on the load or main type of the valve. The main types of safety valves are spring-loaded, weight-loaded and controlled safety valves.

Regardless of the type or load, safety valves are set to a specific set pressure at which the medium is discharged in a controlled manner, thus preventing overpressure of the equipment. In dependence of several parameters such as the contained medium, the set pressure is individual for each safety application.

Yes. Electrical testing will need to be done to check the power cord of the espresso machine. If the power cord is bad, we recommend professional repair.

Confirm that water is coming through the group head when the lever is lifted, and that this has been isolated to a steam boiler issue. (You can still get water out of the group head without the boiler being full.We should be making sure the autofill function has successfully filled the boiler. Easiest way, remove the probe from the autofill and let it run for a few seconds, watching the level in the tank and see if it starts to drop. Put probe back on. Do not run this for too long or you will overfill the boiler and water will pour from the safety).

No. Allow machine to cool, remove the housing, remove the copper pipe off the back of the hot water valve and check for a blockage if no blockage is present in the valve or the end of the pipe, a blockage is present on the boiler side. Should be sent in for repair/descale of hydraulic system.

Removing, cleaning and lubricating your valves can be a quick fix for a leaky or sticky valve, and is good for keeping them up and working properly. You will be required to remove the housing from your machine. Watch this video to learn how to rebuild the steam and hot water taps (valves) of the Expobar Brewtus and Lever espresso machines.

DISCLAIMER: Do NOT use any chemical cleaning products. This can strip the chrome plating from the valve. Soap and hot water will be sufficient for cleaning the valve.

No. Allow machine to cool, remove the housing, remove the copper pipe off the back of the steam valve and check for a blockage if no blockage is present in the valve or the end of the pipe, a blockage is present on the boiler side. Should be sent in for repair/descale of hydraulic system. How to Remove Hot Water Valve (From Wiki)

Remove the nut at the top of the group head and check the valve. It is sometimes called a mushroom valve or jet. Inspect this for any scale or mineral deposits. Clean it really well. Hold it up to a window or a light to make sure that the hole is clear of any scale or minerals. If no improvement, move on to the next step.

Move the lever up and down and see if resistance is felt in any direction from the cam moving between actuators (valves). If it will not drain, and not much resistance is felt, remove the bottom of the E61 group head and inspect the actuators. They may be broken, or ground down from poor maintenance that the cam does not make contact with the top of the actuator.

Yes, Raise the brew lever and see if water comes out of the brew group. If it does we know the pump and water circuit is working fine. The problem is probably in the steam boiler fill solenoid valve. It may be blocked or stuck.

Is steam pressure too high? Safety valve will vent when steam pressure exceeds a certain point. Try turning down pressurestat. If this doesn’t work, replace pressurestat.

If the safety is still leaking, replace the safety valve. Do not take it apart and clean it. Safety valves contain a teflon diaphragm. On older machines, debris and buildup can form here, this will allow steam to escape when steam pressure is built. We strongly advise against removing the copper plug and opening the safety valve. Don"t do it. This could result in incorrectly adjusting the safety, which will then prevent it from blowing off excess steam like it should. The safety should just be replaced.

There is an o ring in there. You can try to tighten the nut first. If that doesn’t stop the leak, take it off, and check on the o ring that sits in there. The O ring should be placed at the bottom of the nut, not necessarily around the ball of the wand.The o ring will have some play to it. It gets tightened in to place when the nut is tightened to the valve.

Removing, cleaning and lubricating your valves can be a quick fix for a leaky or sticky valve, and is good for keeping them up and working properly. You will be required to remove the housing from your machine. Watch this video to learn how to rebuild the steam and hot water taps (valves) of the Expobar Brewtus and Lever espresso machines.

DISCLAIMER: Do NOT use any chemical cleaning products. This can strip the chrome plating from the valve. Soap and hot water will be sufficient for cleaning the valve.

A leak can either be caused by debris in the valve, that is preventing the teflon tape to seal, or the teflon tape itself is worn, been tightened down too much, and will no longer seal and needs to be replaced.

Make sure that the green and yellow ground wire did not come loose from the control board. This usually results in the safety valve spraying like a sprinkler, not just a “leak”.

If the safety is still leaking, replace the safety valve. Do not take it apart and clean it. Safety valves contain a teflon diaphragm. On older machines, debris and buildup can form here, this will allow steam to escape when steam pressure is built. We strongly advise against removing the copper plug and opening the safety valve. Don"t do it. This could result in incorrectly adjusting the safety which will then prevent it from blowing off excess steam like it should. The safety should just be replaced.

There is an o-ring that is loose, dirty, or worn out. Take out this mushroom valve, clean any scale or debris, and reseat the valve. All of these parts are separated by teflon rings. It could just be loose and slightly tightening could stop the leak, but with heat and age its possible the teflon is no good. Tightening the bit down more will only further deform the teflon allowing a leak to still continue, these should be replaced.If it is still leaking, replace the gasket that separates it from the top of the group head. To access these parts use an open ended wrench or adjustable wrench to remove the smaller top bolt of the E-61. This will give you access to the first o-ring and spring assembly. To access further down into this part of the grouphead use a wrench to remove the large bolt. This will let you access the other o-ring, another spring assembly, and the valve assembly. Inspect all of these components for integrity. Clean any dirty parts and replace any broken parts. Reassemble the grouphead and see if the leaking is resolved.

Making adjustments to the grind is going to have the biggest impact on the coffee extraction. If it is too coarse, the coffee is going to come through too fast, and not extract long enough. How to Grind For Espresso

It is important to use fresh beans, typically beans roasted within the past two weeks are best. Light and medium roasts are best for espresso brewing and richer crema.

This is a replacement overpressure valve, also referred to as a safety valve for Rocket home espresso machines. It is compatible with the Rocket Apartamento and the Rocket Mazzafiato.

9 PCS Coffee Maker Set Capacity: 6cups Easy to make espresso in 3 minutes Optimal cycle to maker coffee Automatic switch off, power indicator light Keep warm function Over heating and Boil-dry safety protection Convenient 360 Degree Rotation, cordless and detachable from base Output: 450w Votiage: 220-240v/110v Frequency: 50-60hz/60hz