ABOUT THIS PART
Generant RVA relief valve, 1/2 in MNPT male, ASME coded and National Board certified, with the UV and NB stamps on the valve itself. Two set pressures, 22 psi (1.5 bar) and 100 psi (6.9 bar), both $269.00.
SPECIFICATIONS
| Manufacturer | Generant |
|---|---|
| Series | RVA |
| Type | ASME coded relief valve, factory set and permanently locked |
| Connection | 1/2 in MNPT, male |
| Port code | 500B |
| Set pressures offered | 22 psi (1.5 bar), 100 psi (6.9 bar) |
| Code | ASME BPVC Section XIII |
| Certification | National Board certified |
| Stamps | ASME UV and NB, on the valve |
| Seal | Fluorosilicone. Generant fits Fluorosilicone from 20 to 149 psi (1.4 to 10.3 bar), which covers both pressures we offer |
| Temperature rating | -320 F to 392 F (-196 C to 200 C) |
| Orifice area | 0.062 sq in (40 mm sq) |
| Discharge coefficient Kd | 0.667, derated |
| Full rated flow | At 110 percent of set pressure |
| Back pressure tolerance | Up to 10 percent with no effect on set pressure |
| Service | Gas service only. Cryogenic media requires vapor barrier piping upstream |
| Set tolerance, below 49 psi (3.4 bar) | Plus or minus 1.45 psi (0.10 bar) |
| Set tolerance, 49 psi (3.4 bar) and above | Plus or minus 3 percent |
| Set tolerance standard | EN ISO 4126-1 |
| Adjustable | No. Factory preset and permanently locked |
| Factory testing | 100 percent tested for crack and reseat |
| Cleaning | Cleaned and packaged for oxygen service per CGA G-4.1 |
| Replacement interval | 12 months |
| Replace sooner if | It has vented |
| Stock | Built to order |
| Lead time | Typically one to two weeks. Longest we have seen, 12 weeks |
| Source | Generant RVA datasheet SA.SL.RVA001.D.6914 |
| Ships from | Bend, Oregon |
This is the valve to fit when the jurisdiction, the AHJ or the insurer asks for an ASME stamp. The brass CRV we also stock is not coded and will not satisfy an inspector who asks for one.
The short version
- Code: ASME BPVC Section XIII, National Board certified, UV and NB stamps on the valve
- Connection: 1/2 in MNPT male, port code 500B
- Seal: Fluorosilicone, which is what Generant fits from 20 to 149 psi (1.4 to 10.3 bar), so on both pressures we stock
- Orifice area: 0.062 sq in (40 sq mm), derated Kd of 0.667
- Full rated flow at 110 percent of set pressure. Back pressure to 10 percent has no effect on the setting
- Temperature: -320 F to 392 F (-196 C to 200 C), per Generant RVA datasheet SA.SL.RVA001.D.6914
- Gas service only. On cryogenic media it needs vapor barrier piping upstream
- Set pressure is factory preset and permanently locked. It is not adjustable
- Cleaned and packaged for oxygen service per CGA G-4.1
Set pressures and price
| Set pressure | Price | Stock |
|---|---|---|
| 22 psi (1.5 bar) | $269.00 | Usually in stock |
| 100 psi (6.9 bar) | $269.00 | Usually in stock |
We try to always stock these, can sometimes be out of stock due to Generant build schedule. Figure one to two weeks, and the longest we have ever seen is 12 weeks. Generant builds the RVA across a wider range, so email info@nboler.com for a setting we do not list.
One installation requirement worth reading twice
The RVA is rated for gas service only. On cryogenic media it must be installed with vapor barrier piping upstream, the candy cane. Plumb it straight into liquid and it will not do what the datasheet says, and an inspector will ask.
RVA or the brass CRV
| Generant RVA | Generant brass CRV | |
|---|---|---|
| ASME coded | Yes, UV and NB stamps | No |
| Connection | 1/2 in MNPT | 1/4 in or 1/2 in MNPT |
| Set pressures | 22 and 100 psi (1.5 and 6.9 bar) | 10 to 350 psi (0.7 to 24.1 bar) |
| Seal | Fluorosilicone | Fluorosilicone below 50 psi, PCTFE at 50 psi and above |
| Temperature | -320 F to 392 F (-196 C to 200 C) | -320 F to 165 F (-196 C to 74 C) |
| Service | Gas only, vapor barrier piping on cryogenic media | Liquid or vapor at 50 psi (3.4 bar) and above |
| Price | $269.00 | $84.00 |
If nobody is asking for a stamp, the CRV is the cheaper part and does the same job. For the high flow relief on a solvent tank or recovery vessel top, the part is the Conrader SRV530 instead.
Accuracy, testing and service life
- Set tolerance: plus or minus 1.45 psi (0.10 bar) below 49 psi (3.4 bar), plus or minus 3 percent at 49 psi (3.4 bar) and above, to EN ISO 4126-1
- Every valve is 100 percent factory tested for crack and reseat before it ships
- Replace every 12 months. An ASME relief on a large vessel should not be lifting at all
- If yours has vented, look at it now rather than at its next interval
- Background: Cryogenic relief valve selection and ASME vs non-ASME extraction equipment
All published ratings on this page are transcribed from Generant RVA datasheet SA.SL.RVA001.D.6914. Ships from Bend, Oregon.
| FITS | Fits any 1/2 in FNPT port where an ASME coded relief is required by the jurisdiction, the AHJ or the insurer. Carries ASME BPVC Section XIII compliance, National Board certification and the UV and NB stamps on the valve. RATED FOR GAS SERVICE ONLY: on cryogenic media it must be installed with vapor barrier piping upstream, a candy cane, or it will not perform to the datasheet. Both offered pressures, 22 psi (1.5 bar) and 100 psi (6.9 bar), use a Fluorosilicone seal, and the valve is rated -320 F to 392 F (-196 C to 200 C) per Generant RVA datasheet SA.SL.RVA001.D.6914. This is NOT the brass CRV; the CRV is not ASME coded and will not satisfy an inspector asking for a stamp. For the high flow relief on a solvent tank or recovery vessel, see the Conrader SRV530. |
|---|
▦ IN YOUR MANUAL
This part appears in the operator manual that ships with your system. The QR code there links to this page.
◈ REFERENCE FOR THIS PART
COMMON QUESTIONS
Is this valve ASME coded?
Yes. It meets the safety relief valve requirements of ASME BPVC Section XIII, is National Board certified, and arrives with the ASME UV and NB stamps on the valve itself.
What is the difference between this and the brass CRV?
The stamp. The RVA is ASME coded and National Board certified. The brass CRV is not, and it will not satisfy an inspector who asks for a coded relief. If nobody is asking for a stamp, the CRV is the cheaper part and does the same job.
Can I plumb this straight into liquid?
No. The RVA is rated for gas service only. On cryogenic media it must be installed with vapor barrier piping upstream, commonly called a candy cane. Plumbed straight into liquid it will not perform to the datasheet.
What seal is in it?
Fluorosilicone. Generant fits a Fluorosilicone seal from 20 to 149 psi (1.4 to 10.3 bar), which covers both the 22 psi and the 100 psi we offer. The FS in the part number is the seal code.
How cold can it go, and how hot?
Rated -320 F to 392 F, which is -196 C to 200 C, per Generant RVA datasheet SA.SL.RVA001.D.6914.
What is the orifice and flow coefficient?
Orifice area is 0.062 square inches, which is 40 square millimeters, with a derated discharge coefficient Kd of 0.667. Full rated flow is reached at 110 percent of set pressure.
Is the set pressure adjustable?
No. The setpoint is factory preset and permanently locked, and every valve is 100 percent factory tested for crack and reseat before it ships.
How accurate is the set pressure?
Plus or minus 1.45 psi (0.10 bar) below 49 psi (3.4 bar), and plus or minus 3 percent at 49 psi (3.4 bar) and above, to EN ISO 4126-1.
Is it clean for oxygen service?
Yes. Supplied cleaned and packaged for oxygen service per CGA G-4.1.
How often should it be replaced?
Twelve months. An ASME relief on a large vessel does not see much cold and should not be lifting at all. If yours has vented, look at it now rather than waiting for the interval.
Do you stock it?
Not on the shelf. These are built to order. Lead time is typically one to two weeks, and the longest we have ever seen is 12 weeks.
Do you carry other set pressures?
We offer 22 and 100 psi, which is 1.5 and 6.9 bar, both built to order. Generant builds the RVA across a wider range. If you need a different setting, email info@nboler.com and we will quote it.