Sanitary Tank Pressure Relief Valve, Pressure Adjustable Type

Reference: SV-9C
Sizes available: 1", 1.5", 2" (DN25-DN50)
End connection: sanitary tri-clamp, butt-weld, thread
Body material: ASTM 304 (1.4301), 316L (1.4404)
Seal material: EPDM, Silicone or Viton (FPM)
Positive pressure: 7.3-29psi (0.5-2 bar)
Negative pressure (vacuum): 4.35-13psi (0.3-0.9 bar)
Pressure adjustable: screw clockwise or anti-clockwise to increase or decrease pressure
Temperature range: -22°F to 266°F (-10℃ to 130℃)
Surface Finish: Ra 16-32µin (0.4-0.8µm), Ra 32µin as default.


SV-9C series is a pressure adjustable Sanitary Tank Pressure Relief Valve, it is mainly used in pressure vessels or pipe systems. The pressure relief valve has two functions:

● From the Pressure side, when the valve is normally closed and the tank pressure exceeds the rated pressure on the outside of the valve, the valve automatically opens and vents the air to the atmosphere.

● From the Vacuum side, when the valve is normally closed and there is a vacuum in the tank , the vacuum piston inside the valve opens automatically and draws air into the tank. In return, this keeps the pressure inside and outside the tank balanced.


To adjust PRV pressure relief, use a tri-clamp Tee with gas inlet on one port, pressure gauge, and PRV on the other 2 ports. Wear protect eyewear or face shield. Set the gas inlet to the desired relief pressure and validated with a pressure gauge reading. Adjust with a 3/8″ drive rachet wrench so gas is just leaking out at the desired pressure. Screw clockwise to increase pressure, anti-clockwise to decrease.


Body Material ASTM 304 (1.4301), 316L (1.4404)
Seal Material EPDM or Viton (FPM)
End Connections butt-weld, sanitary tri-clamp, thread
Working pressure 7.3-29psi  (0.5-2 bar),  set pressure at 14.5psi (1bar) as default
Vacuum 4.35-13psi  (0.3-0.9 bar)
Pressure adjustable screw clockwise or anti-clockvise to increase or decrease pressure.
Temperature range -22°F to 266°F (-10℃ to 130℃)
Internal Finish Ra 16 ~ 32µin (0.4 ~ 0.8µm), Ra 32µin as default.
External Finish Ra 16 ~ 32µin (0.4 ~ 0.8µm), Ra 32µin as default.


● Pressure adjustable.
● 100% inspected and pressure tested before shipping.
● Hygienic stainless steel design, , all springs SS304.
● Tri Clamp fitting


Drawing - Sanitary Tank Pressure Relief Valve


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