Gas pressure relief valve RA

for liquidsBSPTlow-pressure

Features

• High-precision cracking performance with excellent sealing
• Compact and lightweight construction
• Suitable for fluids that may be vented to atmosphere
• Available in multiple pipe sizes (R1/8 to R1")
• Set pressure adjusted at the factory; optional low-range settings available

Description
Operation fluid: Gases / liquids that do not corrode wetted parts
Pipe size: R1/8 to R1"
Proof pressure: 1.62 MPa
Set pressure: 3 to 1080 kPa ※For pipe size 1/8" range is 3 to 970 kPa. ※3–29 kPa available as an option.
Body material: Brass (Ni plating) / SUS316
Seal material: Fluororubber (FKM) standard
Remarks: Brass bodies are nickel plated. When set pressure is under 5 kPa, OUT port orientation must be upward only.

Dimension / Material
Dimension table (<mm>)
Pipe size (R) - A - HEX
1/8 - 25.5 ±2.0 - 13.0
1/4 - 31.0 ±2.0 - 17.0
3/8 - 33.0 ±2.0 - 19.0
1/2 - 44.8 ±3.0 - 26.0
3/4 - 52.4 ±3.0 - 29.0
1" - 72.8 ±3.0 - 38.0

Material table
① Body - Brass (Ni plating) / SUS316
② Nut - SUS316L
③ Guide - Brass or Stainless (SUS316 or SUS316L)
④ Spring - SUS304 or SUS316
⑤ Poppet - Brass / SUS316
⑥ Special Seal - FKM [V] (Standard)

Flow characteristics
Flow characteristics diagram available for reference.

Ordering information
Ordering information diagram and ordering illustrations available for selection.

Applications

• General machinery: milling machines, lathes, machining centers, laser and water-jet systems, boilers
• Industrial furnaces: heating furnaces, vacuum furnaces, combustion equipment
• Medical devices: oxygen concentrators, sterilizers, analyzers (when non-corrosive fluids are used)
• Analytical & measurement equipment: gas analyzers, gas detectors, environmental measurement instruments
• Gas generation systems: compressors, small pressure vessels, gas generators
• Other: glove boxes, oxygen chambers

Technical specifications

• Series: RA Series
• Operation fluid: Gases / liquids that do not corrode wetted parts
• Pipe size range: R1/8 to R1"
• Proof pressure: 1.62 MPa
• Set pressure range: 3 to 1080 kPa (for 1/8": 3 to 970 kPa; 3–29 kPa available as option)
• Body materials: Brass (Ni plating) or SUS316
• Seal material: Fluororubber (FKM) standard