Model RVA-05 |
Relief Valve |
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Features
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Applications
This is a compact inexpensive gas valve which is normally used for air or gases such as nitrogen, hydrogen and other gases which can be safely discharged to atmosphere. This RVA05 valve in a 3/8" size is very popular & is used in a hydrogen generator that is set for 85 psig, and is used for automotive use to conserve gasoline. This model can be priced and ordered on line by selecting body and piston 303SS, Viton seat, and 302SS spring and requesting a set pressure of 85 psig. For pricing or ordering with these options preselected, click on this link #N0422. Type in a discount code H2 to get a 10% discount only when this item is ordered on line through our website. The 10% discount is not available with phone or fax orders. Note we do not manufacture other related fittings for the hydrogen kit which is sold by others, only the valve.
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 model Rvi-05 series valves 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 Stra-Val to help solve this problem.
Options
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.
Principle of Operation
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) . 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.
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Valve must be removed from its port to adjust |
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RVA-05 The illustration above is shown with the valve in the closed position |
| 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 |
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: |
1/8" Rva05-01T | 1/4" RVA05-02T | 3/8" Rva05-03T | 1/2" Rva05-05t |
| 3/4" Rva05-07t | 1"Rva05-10T | 1 1/4"Rva05-12t | 1 1/2" Rva05-15t | |
| 2"Rva05-20t |
2 1/2" Rva05-25t (call for pricing) |
3"Rva05-30t (call for pricing) |
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To price or order, first select a size above.
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