Superlok Adjustable Relief Valve, 1/4" Tube, 10-250 and 225-750 PSI
ABOUT THIS PART
An externally adjustable, spring loaded relief valve in 316 stainless with 1/4 inch tube fittings on both ends. Two versions, and they are not the same valve with a different spring. 10-250 psi (0.69-17.2 bar), $219.95. 225-750 psi (15.5-51.5 bar), $164.95 on clearance.
Two versions, and the difference is the body
| 10-250 psi | 225-750 psi | |
| Part number | SRVL-S-4-S316 | SRVH-S-4-Y-S316, Y for the yellow spring |
| Cracking pressure range | 10 to 250 psi (0.69 to 17.2 bar) | 225 to 750 psi (15.5 to 51.5 bar) |
| Body rating | 300 psig (20.6 bar) maximum working pressure | 6,000 psig (413 bar) maximum working pressure |
| Price | $219.95, was $268.80 | $164.95 clearance, was $241.92 |
| On hand | 6 | 9, not being restocked |
| Where it goes | The adjustable PRV on our Diamond Mine | Formerly on 250 psi (17.2 bar) hydrocarbon systems |
The high pressure valve is not a stiffer spring in the same housing. It is a different valve, with twenty times the body rating. And because of how the two are built and sourced, the 6,000 psig (413 bar) one costs us less than the 300 psig (20.6 bar) one, which is the opposite of what anyone expects.
The 225-750 is on clearance because we no longer put these on hydrocarbon systems. They got expensive, and a cryogenic relief valve does the same job for a fraction of the money. More to the point, this valve does not rate down to the low temperatures a hydrocarbon system actually sees. The O-rings are Viton. We have nine left and no use for them.
Which relief valve do you actually need
- Does your line run cold? Then not this one. Use a cryogenic relief valve. Our 1/4 inch and 1/2 inch Generant cryogenic valves are rated to -320 °F (-196 °C) and cost far less than this. Our article on cryogenic relief valve selection walks through the choice.
- Do you need to change the set pressure later? Then this one. It is externally adjustable across its range. A Generant is ordered at a fixed set pressure and stays there.
- Is it going on a Diamond Mine? Then the 10-250 psi version, which is the adjustable PRV specified on that vessel.
Specifications
| Body, bonnet, adjusting nut, retainers | 316 stainless steel |
| Seat | PTFE |
| O-rings | Viton. This is why the valve is not for cryogenic service |
| Connections | 1/4 in tube, both ends |
| Pattern | Angle, inline |
| Orifice | 4.8 mm (0.189 in) |
| Temperature range | -30 °F to 300 °F (-34 °C to 149 °C), as listed for the Superlok adjustable PRV in 3P Certz engineering report ECR-190082-R3 |
| Adjustment | External, anywhere across the spring range |
| Lead time, 10-250 | Usually on the shelf. Otherwise typically one to two weeks, and the longest we have seen is 12 weeks |
| Lead time, 225-750 | Stock on hand only |
Set it with the system depressurized and verify it before you rely on it.
If it is going on a Diamond Mine, read your certification report before you set it. 3P Certz caps the setting on the adjustable PRV they certify, and a pressure above that cap voids the certification. Call 541-330-6409 with your report number and we will read it with you.
Stock, and what it is not
- Six of the 10-250 psi (0.69-17.2 bar) and nine of the 225-750 psi (15.5-51.5 bar), on the shelf in Bend
- We keep restocking the 10-250, because it goes on a product we build. The 225-750 is the last of them
- It is not a cryogenic valve and should not be treated as one
- It is not an ASME code safety valve and carries no code stamp. It is an instrumentation relief valve
- It is not a tri-clamp fitting, and tube, nuts and ferrules are not included. A 1/4 inch tube fitting needs a nut and ferrule set on each side, which we sell separately
SPECIFICATIONS
▦ 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
What is the difference between the two versions?
The body, not just the spring. The 10-250 psi valve is a low pressure body rated to 300 psig (20.6 bar) maximum working pressure. The 225-750 psi valve is a high pressure body rated to 6,000 psig (413 bar) with a yellow spring. They are different valves.
Why is the higher pressure one cheaper?
Because of how the two are built and sourced. It surprises everybody, including us, but the 6,000 psig (413 bar) body costs less than the 300 psig (20.6 bar) one.
Why is the 225-750 on clearance?
We used to put these on 250 psi (17.2 bar) hydrocarbon systems and we no longer do. They got expensive, and a cryogenic relief valve does the job for less money and rates to a far lower temperature. We have nine left with no use for them.
Can I use this on a cold line?
No. The O-rings are Viton and this valve is not rated for cryogenic service. 3P Certz lists it at -30 F to 300 F, which is -34 C to 149 C, in engineering report ECR-190082-R3. If your line runs cold, use a cryogenic relief valve. Ours are rated to -320 F (-196 C) and cost less than this.
When would I choose this over a cryogenic relief valve?
When you need to change the set pressure yourself. This valve is externally adjustable across its range. A cryogenic relief valve is ordered at a fixed set pressure and stays there.
Which one goes on a Diamond Mine?
The 10-250 psi (0.69-17.2 bar) version. That is the adjustable PRV specified on that vessel. Before you set it, read your certification report: 3P Certz caps the setting on the PRV they certify and a pressure above that cap voids the certification.
Is it adjustable while installed?
It is externally adjustable across the spring range. Set it with the system depressurized and verify it before you rely on it.
What is it made of?
316 stainless steel body, bonnet, adjusting nut and retainers, with a PTFE seat and Viton O-rings.
What size are the connections?
1/4 inch tube on both ends. You need a nut and ferrule set on each side, not included, sold separately here.
Is it an ASME code safety valve?
No. It carries no code stamp. It is an instrumentation relief valve.
What is the orifice?
4.8 mm, which is 0.189 inch.
How many do you have?
Six of the 10-250 psi and nine of the 225-750 psi, in Bend.
Will you restock them?
The 10-250 yes, because we build a product that uses it. The 225-750 no, that is the last of them.
What is the lead time?
The 10-250 is usually on the shelf. When it is out, lead time is typically one to two weeks, and the longest we have ever seen is 12 weeks. The 225-750 is stock on hand only.