RVA-05-EX Exotic Alloy Atmospheric Discharge Relief Valve

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Order as Hastelloy Valve, Titanium Valve or Monel Valve. (Stainless Steel valve Available Here)
1/4"-3" NPT THD
Adjustable relief pressures from 0.5 PSI (0.03 Bar) to 400 PSI (27 Bar)* (multiple springs)
Tamper proof design, requires valve to be removed to readjust

Printable
Product Specs Instructions

RVA-05-EX Exotic Alloy Atmospheric Discharge Relief Valve

view prices order

Printable
Product Specs Instructions

View Pricing/Ordering Instructions

Order as Hastelloy Valve, Titanium Valve or Monel Valve. (Stainless Steel valve Available Here)
1/4"-3" NPT THD
Adjustable relief pressures from 0.5 PSI (0.03 Bar) to 400 PSI (27 Bar)* (multiple springs)
Tamper proof design, requires valve to be removed to readjust

This is a compact economy gas valve which is normally used for air or gases such as nitrogen, hydrogen and other gases which can be safely discharged to atmosphere. Do not use on steam or other hot or dangerous exhaust gases or liquids,unless the valve is properly shielded or contained in an enclosure to prevent injury to nearby operators or personnel passing by . It is best to select a different model where the discharge can be safely piped away. Please refer to our In-Line Relief Valve (Model Rvi-05) which has the extra threaded pipe connections to discharge . To make sure the valves are protected from dirt and debris which might clog 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 Straval to help solve this problem.

Scroll down below to click on a valve size for pricing and then click on the spring range to see which options are available for that size. After selecting your options you may then print out a price, e-mail it (without having to contact the factory), and then when you are ready, proceed to order.
When ordering don't forget to state your desired relief set pressure if you expect the valve to relieve at only one pressure. There is no extra charge for this. 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 engraved.

Body: Standard materials are Hastelloy, Titanium, & Monel.
Poppet: Hastelloy, Titanium, & Monel.
Spring: Standard construction is Stainless Steel, Hastelloy, Titanium, & Monel.
Lock nut: Standard construction is Hastelloy, Titanium, & Monel.
Elastomeric seal: Bubble-tight seal is achieved with standard elastomers such as Buna, Viton, and EPDM & Kalrez. Teflon (PTFE) being a harder material, will not seal to the same degree as the softer elastomers, and less than a bubble tight seal is to be expected.
Tamper-proof construction This valve is not externally adjustable & requires removal of the valve to change the pressure setting.
Adjustable pressure relief valve can be factory-set or adjusted in the field. Springs can be changed to achieve a different pressure range.

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. 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. The valve can be ordered factory-set for a specific relief pressure, or can be adjusted in the field. In order to make the pressure adjustment, the valve needs to be unscrewed from its mounting position with pressure removed from the line. To increase the relief pressure, the spring must be compressed further clockwise looking into the spring, and to reduce the set pressure, visa versa. A small nut driver, screwdriver, or needle nose pair of pliers may be used to make pressure adjustments for the low pressure springs. Where frequent pressure adjustments are anticipated, a special adjusting tool which can be used for the 1/8" & 1/4" sizes only. This tool can be purchased from Straval, Part Number T234 (Click on link to order) . When reinstalling the 1/8" &1/4"Npt model do not exceed 10 ft-lbs on the male pipe thread end as minor distortions to the body may occur if substantially exceeded. The larger sizes can be more easily adjusted with more conventional tools. However, ordering the valve to the correct set pressure at the factory would eliminate or minimize the need for making pressure adjustments in the field.

Valve must be removed from its port to adjust

RVA-05
The illustration above is shown with
the valve in the closed position

Material List and Specification

#	Item	Materials
1.	Poppet	Brass & SS
2.	Seal	Buna, Viton, Epdm, PTFE,Kalrez
3.	Body	Brass & SS
4.	Spring	Stainless steel
5.	Guide	Brass & SS
6.	Nut	Stainless steel

Alternate elastomers available
Alternate materials: See below in ordering options
Other Spring Ranges quoted on application

Dimensions (inches)

Size A	B	C	Size A	B	C
1/8	0.58	1.06	1.25	2.00	4.00
1/4	0.66	1.06	1.5	2.25	4.25
3/8	0.88	1.31	2	3.00	4.25
1/2	1.00	1.75	2.5	2.50	4.25
1	1.25	1.13	3	3.00	6.13

*400 PSI for size 1/4" only

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

RVA-05-EX Exotic Alloy Atmospheric Discharge Relief Valve

RVA-05-EX Exotic Alloy Atmospheric Discharge Relief Valve

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Dimensions/Material Item List