Model RVC-05-FLG

PRESSURE RELIEF VALVE FLANGED 150#, 300#, 600# ANSI

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Stainless steel, Monel, Hastelloy, titanium, or Alloy 20 1/2"-3" flanged (see also threaded NPT model RVC-05                Adjustable relief pressures from 30 PSI (2 Bar) to 1400 PSI (95 Bar) at 300 °F (150 °C)

Features Body: Standard material is stainless steel. Special alloys (e.g. Monel, titanium, Alloy 20, and Hastelloy) also available. Teflon body is also available for pressures below 150 PSI (10 Bar). Not offered in carbon steel construction except for clean lubricating oil type of services. Poppet: Also available in the same materials as the body. Teflon is available for low pressure service (<150 PSI) and where required for corrosion resistance and tighter seat shutoff. Elastomeric seal: Choice of different elastomers including Teflon expands valve usage to a wide range of applications and fluids. Choice of elastomer determines final temperature limitation. Spring chamber: Because it is non-wetted, the standard construction is carbon steel, but can be upgraded to 300 series stainless steel in aggressive environments. Right-angle porting: Standard construction is bottom inlet, side outlet. Also available with sanitary flanges for low pressures.

Applications

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 Backpressure/Bypass valves which will reduce the probability of pressure spikes that often occur when releif valves are selected for pressure control aopplications. Valve should only be used selectively where the materials chosen are compatible with the fluid used and will not cause corrosive buildup or crystallization in the close clearances between the piston and body bore, which could keep the poppet from opening freely. Use only clean, strained, 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 strainer or filter with the appropriate perf or mesh and pressure rating can be purchased from Stra-Val. Apply only where the discharge piping is not subjected to a high back pressure, as this will affect the relief setting. If the back pressure is steady or constant, compensating for the change in set pressure can be simply made by readjusting the spring load, or by using a different spring selection, or selecting a different valve type designed for this.

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.
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.
Standard metal seated valves meet ANSI/FCI Class IV seat leakage standards (0.01% of rated valve capacity, not bubble tight).

Options

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.

Principle of Operation

This is a direct-operated 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. This valve can also be operated by remote pressure adjustment which can be achieved with a dome type air-loaded version. Consult factory.

These valves are not equipped with a manual lever release. However, manual override is accomplished by first locking 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.

RVC-05-FLG

Material List and Specification

1.	Adjusting screw	Steel
2.	Lock nut	Steel
3.	Spring chamber	Steel
4.	Spring pusher	Steel
5.	Adjusting spring	Steel
6.	Spring Carrier	Steel
7.	Poppet	Stainless steel
8.	Body	Stainless steel
9.	Seal	Viton, Buna, EPDM, Teflon, etc.

• Upgrade to all stainless steel is optional for all non-wetted parts

Dimensions

Size	A (in)	B (in)	C (in)
1/2	2-1/2	2-1/2	8-7/8
3/4	2-3/4	2-3/4	9-3/4
1	2-3/4	3	11-1/8
1-1/4	3	3-1/2	12-1/4
1-1/2	3 1/2	3 5/8	13-1/2
2	3 1/2	4-1/2	15-1/2

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

To show prices: Click on a size:	1/2" RVC05-05A	3/4" RVC05-07A	1" RVC05-10A	1 1/4" RCV05-12A (call for pricing)
	1 1/2" RVC05-15A	2" RVC05-20A	2 1/2" RVC05-25A	3" RVC05-30A
To price or order, first select a size above.

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