breville safety valve free sample

Hello Scott, Thank you for the question. According to the Website Availability, this is a Special Order part. This means we do not keep them in stock and order them in from Breville once we have an order for one. As long as Breville has stock ready to ship, this takes about 10-15 Business Days for the part to arrive at the Warehouse and approximately 3-7 business days to ship out and arrive to you. We hope this helps!

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.

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.

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.

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;

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 safety bypass valve, or OPV valve, is it plastic valve that sits on top of the main coffee pump. And steam pumps. The function of the coffee safety valves is not so much safety, but rather to regulate the pressure within the hydraulic system.We will concern ourselves with the function of the coffee bypass valve here. As this valve has an important function in maintaining system pressure within the coffee hydraulic line. Obviously with coffee extraction, pressure is a vital ingredient. You will notice the safety valve has a piece of mesh hose which runs from the valve back into the water tank. As the name suggests the valve bypasses some of the water flow in order to limit the pressure within the hydraulic system.

For example when you make a cup of coffee, the ulka pump will deliver about 15 bars of pressure, thus the bypass valve will divert some water flow into the tank during extraction which results in lower pressure. A small spring-loaded ball valve allows some water to divert when the pressure is high. Obviously this ball valve is only activated when the flow is impeded by coffee grounds or the cleaning disc.

I always replace the OPV valve on the coffee pump when I replace the pump. I do this because these valves have a reputation for being useless. They are only plastic, the tension on the spring is adjusted with a small plastic thread. They are not precise.

The Ulka pump we supply has a brass stem and internally brass bypass. This is the model E, type EX5. I use this model as I believe it has a longer life van the plastic version of the Ulka pump. However it leaves us with a slight challenge in that we must attach the plastic 0PV valve to the brass stem of the pump. The obvious danger here is that we can snap off the plastic OPV valve in the brass stem. So we need to be careful. And are use thread tape and Loctite. See the description below.

I am briefly going to explain how I attach the nylon/plastic? bypass safety valve to my preferred Ulka pump, with the brass stem. I’m explaining this because as I said above I believe the model E type EX5 Ulka pump is superior to the plastic factory fitted variety. So I only stock this pump. And I am being told it’s impossible or poor etiquette to attach plastic to brass.

But I persist as I am certain that the brass stem Ulka pump is superior to the plastic one. This is the subject of another post, but it’s suffice to say I’m happy paying the additional few euro for the better quality pump and there are no issues using them in Breville coffee machines.

While most electric pressure cookers only have a sensor in the base to measure pressure, this one also has a temperature sensor in the lid.  Together, these sensors give the cook a complete picture of what is going on inside and adds extra safety as well.

This pressure cooker is impressively safe.  Since it has two sensors (one in the lid and one in the base) it monitors and adjusts quickly to over-pressure or overheating.  If something should go wrong there are two more back-up systems to ensure that pressure is released safely: the secondary safety valve, and the collapsing gasket. But I did run across a couple of issues, which I detail at the end of this section.

Secondary Safety Valve – Should the primary pressure regulating valve fail, the excess pressure pushes through the nub on the lid when the internal pressure exceeds 17.4psi or 120kpa.

I really love the automatic pressure release feature that this cooker offers.  You can fully program it at the beginning of cooking (pressure, time, opening method and keep-warm) and there’s no need to attend to the cooker until the food isreally ready without having to fiddle with the valve.   Unless.. you’re planning to slow cook-  then you must fiddle.

Knowing what’s going on inside the cooker during the cooking process is handy.  But, the minimum liquid requirement isn’t obvious – Breville defines it in their own “special” way which is pretty darn confusing – even to a professional!

Breville wanted to make it clear when the pressure cooker is operating  so the display can be one of three colors: “Off” to indicate nothing’s going on, “Blue” to indicate the cooker is on and ready for you to choose a program and “Orange” to indicate that one of the programs are engaged and/or the cooker is either building pressure, cooking or losing pressure.

The front of the Breville Fast Slow Pro is spare with just a few “twist and push” buttons.  Most of the functionality is chosen from the screen and you navigate twisting these buttons and then pushing to select something. BUT the organization and location of the three major buttons is awkward.  The first large button on the left is one of the least significant on the control panel.  And, of course, all of the  important functions are located in the smaller, second button on the right.  Instinct always has me reaching for the big button – even after a month of using this pressure cooker – and when nothing happens I finally reach for the second, smaller, correct button.

I really don’t know what happened here – this is not typical of Breville products.  I’ve used their smart oven to do broiling for my in-store U.S. pressure cooker demos and the most important button on that appliance is first.

Now,  between the lid and the buttons feeling like they’re on the wrong side (for a right-handed person), I’m starting to wonder if someone made a mirror image of the pressure cooker Breville intended to make.

I was a little weary about some of the recommendations, but after writing to Breville’s U.S. Test Kitchen manager, who personally tested and adjusted all of the programs and pressures for U.S. cooks (and ingredients)  I dove in and tried my perfect pressure cooker risotto using their program. The risotto was flawless.

If you need to get the cooker open quickly all you need to do is press-and-hold the “Release” button in the front for about three seconds and that will activate the valve for three minutes.  If all the steam is not out, you’ll need to press-and-hold, again, to complete the venting process (or you can just set twist the valve on the lid open using your hand).

If you change your mind about the opening method while the cooker is running- during cooking  the button changes functionality from “choosing” a pressure release to “doing” a pressure release.  I originally thought that I couldn’t change the opening method while the cooker was running  until Breville explained how to do it: Push the “Release” button once (it will release a puff of steam) and watch for the text “Steam Release” on the screen to start blinking.  At this point, move the selector (the SMALL knob) to choose another opening method, and then push it to set.

Right before it releases pressure the cooker does a few chiming beeps and a spurt of steam from the valve to warn the cook and then it goes about releasing pressure according to the chosen program. The pressure is released in three ways:

Let me describe the Auto-pulse release in detail because Breville optimized it to release the most steam without frothing the  liquid inside the pot.  I used it to release pressure of a notoriously frothy split pea soup without incident!  What is fascinating about this release is that releases happen more frequently as the pressure lowers.  The pulses start 18 seconds apart to release steam at full pressure, then when the contents are down to 5psi the releases accelerate to once every 10 seconds and, finally, when the pressure is down to 2.2 psi steam is released every 8 seconds.

I was a disappointed that the10-min Natural release was not included. It’s a pressure release method that has been around for at least 20 years (via Lorna Sass and Jill Nussinow)  and is particularly fantastic for completing rice and grain cooking. Half a ding to Breville for not researching commonly used opening methods more carefully for this key feature.

But the drawback, especially to those not familiar with pressure cooking, is that if you’re going to use the cooker’s built-in lid the valve has to be opened manually  “to the open position, facing away from the lid knob.”  There are no actual indicators, arrows or icons on the lid to show the cook what the “open” position is.

Breville has not implemented the automatic valve control in the Slow Cooking mode.  Instead, they ask the cook to manually open the valve. In my opinion, this is an unnecessary step given that this cooker already has the ability to already open it by itself.. it should.

The outside body of the pressure cooker is Breville’s standard brushed stainless steel and, unfortunately, it shows every fingerprint, smudge and spill.  Trying to wipe it with a microfiber cloth and some warm water and light detergent was fruitless.  I asked Breville how to make the pressure cooker body look nice again and they recommended I clean the outside with stainless steel polish.

Other electrics have identical brushed stainless steel covers that are finger-print resistant.  I really feel Breville should have chosen a higher quality cover for a pressure cooker that is 95% stainless steel.

The Breville BES870XL Barista Express Espresso Machine performs better than expected and in line with its price tag. In my opinion it beats out the similarly priced Gaggia Anima and Breville 800ESXL.

I also love how Breville improved the design of the boiler from the BES860XL to the BES870XL, which now includes a more powerful Thermocoil boiler with PID temp control. In the older model this part was made of separate components bolted together, which led to a long-term risk of leaking as the part wears down. In the BES870XL Breville switched to a single piece of stainless steel with no bolted or assembled parts. That thing isn’t going to leak.

A downside is the difficulty getting replacement parts. For example, the 54mm washer which seals the portafilter to the machine will inevitably wear down after around 2 years of repeated use. Breville does sell this washer but, like several of their replacement parts, it could take several weeks and occasionally multiple requests.

Different beans require different water temperatures. With the Breville BES870XL"s Advanced Temperature Mode, you can adjust the temperature +/- 4ºF in 2ºF increments. This gives you 5 different temperature settings.

The Breville BES870XL Barista Express is a great espresso machine which affords the user a ton of customization. Sometimes that means a lot of questions about how to make the most of it.

Remove the portafilter and make sure there aren’t any coffee grounds on the rim, which would prevent a good seal. Also make sure the portafilter basket is secured firmly to the machine. If neither of these work, it’s also possible the silicone ring on the machine, which seals to the rim of the portafilter, is worn out. If your machine is around 2 years old this is definitely possible. Call Breville for a new part and refer to page 32 of the user manual for instructions showing how to replace this part.

It’s possible the safety feature was activated. To check if this is the case, power off the machine, unplug it from the wall and wait 30-60 minutes to allow it to reset. If that doesn’t fix the issue, call support.

Breville The Fast Slow Pro Pressure Cooker / Multi Cooker is one of the more expensive electric pressure cookers on the market. It’s a well built pressure cooker and has features that other pressure cookers don’t have.

Breville is an Australian company that manufactures and sells small kitchen appliances. In 2002, they expanded their business to the United States and Canada. They sell high quality small kitchen appliances that are typically a bit more expensive than other brands.

I have several Breville small kitchen appliances, their toaster oven and immersion blender, which I’ve had for years and couldn’t love more. Recently, I purchased their stand mixer and the Breville The Fast Slow Pro pressure cooker.

The Breville pressure cooker looks a little different than most electric pressure cookers. It reminds me of something you’d see in a medical lab. I’ve had the Breville pressure cooker for about a month now and while there’s lots to love about it, there are things I don’t like. I’ll start with the pros.

One of the features the Breville has that no other pressure cooker I’ve tested has is the automatic steam release. While you’re setting the pressure cook time, you also select the pressure release method.

Auto quick release – when the pressure cooking time is finished the pressure release valve is pushed up (see the little pin underneath the notch in the pressure release valve below) and the pressure is automatically released.

The pressure release button is on the front of the pressure cooker not the pressure release valve. So you don’t have to be frightened by having your hand by the hot steam when the pressure is released.

Pressure Cook – the pressure cook pre-settings are vegetables, rice, risotto, soup, stock, beans, poultry, meat, bone-in meat, chili & stew, dessert and a custom setting (similar to the manual or pressure cook setting on the Instant Pot).The Breville user manual has a good reference guide that lists the pre-set time, psi, and release method for each of the settings. The guide also gives examples of when you should use that setting for example use the poultry button for whole chicken, bone-in chicken pieces, duck legs, cornish hens.

The lid does not remove all the way. The lid arm is permanently attached. I like to store my lids upside down on the pot which doesn’t work very well with the Breville. Make sure you have a space on your counter so the lid can open without hitting your cabinets.

The Breville The Fast Slow Pro comes with a stainless steel steamer basket and rack, a well-written manual, and recipe booklet. It is available on Amazon, Williams and Sonoma, and other high end kitchen stores.

Pressure / pressure gauge: Breville Barista Pro works on a low pressure pre-infusion, and on a 9 bar extraction pressure, which delivers rich and creamy coffee in every cup. The pre-infusion soaks the ground coffee and helps it expand for amazing espresso results.

Enjoy your favorite coffee at its best with precise temperature and brewing time. The Brewer Precision Pour-Over Adaptor Kit from Breville features a unique brewing menu that allows you to brew a 12-cup carafe in less than 7 minutes.