Use these valves for emergency relief where pressures must be relieved quickly to reduce damage that could result from overpressure in a system. Where the overpressure needs to be controlled more gradually ,such as in back pressure or pump bypass applications use our Back-pressure/Bypass valves which will reduce the probability of pressure spikes that often occur when relief valves are selected for pressure control applications. Standard metal seated valves meet ANSI/FCI Class IV seat leakage standards (0.01% of rated valve capacity,  not bubble tight).

Scroll down below to select the valve size, spring range, material options in the customized pricing and ordering section indicated by the red arrows. You have the ability to customize your valve choices by selecting the wetted and nonwetted materials, and choice of seat materials to suit your shutoff requirements, using the softer seats for improved shutoff, particularly for air or gas applications where they are available at the lower pressures. Once these selections are made a price quote can be generated and printed directly to your computer or immediately e-mailed to you. When ordering don't forget to state your desired relief set pressure if you expect the valve to relieve at only one pressure. This pressure will be engraved on the valve body. If the set pressure is not specified, the valve will be set at or below the stated spring range as selected for the order and no set pressure will be stamped on the nameplate.

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6.) Click on the large "Continue" button to apply quantity and resale discounts, Print, E-mail the quote to yourself, or to Order.  You  will be given a  resale discount code if you are an eligible reseller or OEM.

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This 2 1/2 inch stainless steel reduced pressure zone assembly backflow preventer helps prevent the reverse flow of contaminated water.

PressureReducing Valve

... parts necessary to repair the bonnet and vent float of the applicable pressure vacuum breaker. All parts are genuine and original to the valve.

5.) As you click on each option, you will see the subtotal change. You must click on all available options before proceeding to the next step.

First select a size, then the appropriate pressure rating or pressure group. Now a spring range by clicking on the round circles. Then select the proper material for the body #8 and poppet #7 which are the only wetted materials in this valve. Next, select the proper piston seal material #9, which must also be suitable for the media used. The more elastic Buna and Viton & Epdm seals tend to create less of a piston drag than the harder Teflon (PTFE) seal. The softer elastomeric seals produce a much closer band between crack and reseating pressures. Normally viton will handle most solvents, oils and chemicals and can handle most media between 300F to 400 deg F. Next select the Spring chamber #3, spring hardware #1 & #2. The adjusting spring #5 is normally supplied in a chrome silicon steel which is completely protected inside the spring chamber and is not wetted or exposed to the flow media. These are all isolated (non-wetted) from the fluid media and should be selected based on the external environment the valve is exposed to. The carbon steel spring chamber, when selected, is painted on the exterior and interior to withstand normal atmospheric corrosion. After the customized selection is made, click to continue and instructions will be provided to either print or save the selection or to proceed with ordering the item on line. Printing the selection will not commit one to ordering the items selected. Should you have any questions on the product capability or product options, or are having difficulty in making the pricing selections or ordering, please contact us by e-mail or phone between 9AM-5PM Eastern time, Monday-Friday.

Series 957-FS reduced pressure zone assembly backflow preventers help stop the reverse flow of liquids due to backpressure or backsiphonage.

These valves do not 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.

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These valves are not equipped with a manual lever release. However, manual override is accomplished by first unlocking the spring lock nut to the adjusting screw and backing it out enough to open the poppet to release pressure, and then repositioning it to its original preset locked condition without losing the original set pressure. This procedure is recommended periodically to flush the seat and to check for proper opening of the valve piston.

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.

PRVvalve

Note: Dimensions are approximate and are subject to change without notice. Request certified dimensions before final product installation.

Safety relief valve should only be used selectively where the materials chosen are compatible with the fluid used and will not cause corrosive buildup, crystallization or solidification in the close clearances between the piston and body bore, which could keep the poppet from opening freely. Use only clean, strained (#20 mesh min), or filtered liquids or gases so that the  valve can operate without buildup of debris or solid matter which can cause the valve to malfunction. A basket strainer or high-pressure filter with the appropriate material and pressure rating can be purchased from Stra-Val. Avoid locating the valve where freezing can occur, and if unavoidable, take precautions to insulate or heat wrap valve and piping to keep from freezing.

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4.) By placing your mouse over each option you will see a pop up display with helpful information including temperature limits for that material or option

This is a poppet and spring type relief valve where the spring constantly opposes the pressure acting against the poppet which seals off the inlet port from the outlet port at the valve seat. The desired set pressure or relief is achieved by compressing the spring until the spring force is adequate to balance the pressure force acting against the poppet. When the inlet pressure exceeds the set pressure, the poppet will open to relieve the excess pressure. The valve will operate in a vertical orientation as illustrated, horizontal, or any other orientation.

You may need to replace your water pressure regulator if you notice a significant decrease in water pressure when using multiple faucets at once.

2023422 — Loosen the locknut on the top of the device using a wrench to gain access to the adjusting bolt for your water pressure valve adjustment.