Sanitary Vacuum Breaker, Adjustable Sanitary Tank Vacuum & Pressure Relief Valve

Reference: SV-9D, New Design
Sizes available: 1"-4" (DN25-DN100)
End connection: sanitary tri-clamp, butt-weld, thread
Body material: ASTM 304 (1.4301), 316L (1.4404)
Seal material: EPDM or Viton (FPM)
Positive pressure: 7.3-29psi (0.5-2 bar)
Negative pressure (vacuum): 7.3-13psi (0.5-0.9 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-9D series is an adjustable Sanitary Vacuum & Pressure Relief Valve for pressure vessels or pipe systems, the valve has two functions:

● From the Pressure side, when the valve is normally closed and the tank pressure exceeds the rated pressure (set at 14.5psi/1bar as default) 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 (set at -13psi/-0.9bar as default), 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 the PRV pressure relief valve, use a tri-clamp Tee with gas inlet on one port, pressure gauge and PRV on the other 2 ports. Wear protective eyewear or face shield, set the gas inlet to the desired relief pressure and validated with a pressure gauge reading. Adjust with a wrench so gas is just leaking out at the desired pressure.


Body Material ASTM 304 (1.4301), 316L (1.4404)
Seal Material EPDM or Viton (FPM)
End Connections butt-weld, sanitary tri-clamp, thread
Positive pressure: 7.3-29psi  (0.5-2 bar),  set pressure at 14.5psi (1bar) as default
Vacuum pressure: 4.35-13psi  (0.3-0.9 bar),  set pressure at 13psi (0.9bar) as default.
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 design, 100% stainless Steel, all springs SS304.
● Tri-clamp fitting


Drawing - Sanitary Vacuum Breaker


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