Principle And Characteristics Of A New Type Of Sanitary Clamp Pressure Vacuum Relief Valve

For hygienic tanks in food, beverage, and pharmaceutical lines, overpressure can rupture vessels and vacuum can collapse them. The sanitary pressure relief valve with dual‑function design combines pressure relief and vacuum breaking in a single clamped assembly – automatically venting excess pressure (0.5–2 bar set point) and admitting air during vacuum events (down to –0.9 bar). This eliminates separate valves, cuts installation points by 50%, and maintains a crevice‑free, drainable flow path meeting 3‑A standards. Set pressure with a simple spring adjustment, mount vertically, and the valve handles both overpressure and vacuum without manual intervention.

The Dual‑Function Requirement in Hygienic Tanks

Storage and fermentation tanks face pressure surges from filling, emptying, CIP, or temperature shifts. Without protection, overpressure ruptures vessels, while vacuum implodes them. A sanitary pressure relief valve addresses both. When internal pressure exceeds set point, the valve opens to release air. When vacuum occurs, it admits air to equalize pressure.

How the Dual‑Function Design Works

The valve integrates two mechanisms in one body:

• Pressure relief – spring‑loaded disc lifts at set pressure, venting excess.

• Vacuum relief – flexible seal opens below atmospheric, admitting air.

• Fail‑safe return – both mechanisms reset automatically when normal pressure restores.

For monitoring, the sanitary prv accepts a pressure gauge for real‑time readings.

Performance Specifications (Clamped Type)

Clamped ends meet 3A, DIN, and SMS hygienic standards.

Design Features

• Clamp connection – rapid disassembly for inspection.

• Polished internals – Ra ≤ 0.8 µm prevents bacterial adhesion.

• Dead‑leg free – body geometry ensures drainage.

• FDA‑compliant seals – EPDM or FPM gaskets resist CIP chemicals.

• Compact footprint – dual function saves space.

For biopharma, the hygienic pressure relief valve offers electropolished and bellows‑sealed options.

Advantages of the Integrated Design

• Eliminates two valves – lowers purchase cost and labor.

• Fewer leak points – reduces contamination paths.

• CIP/SIP compatible – cleans without disassembly.

• Automatic reset – no manual intervention required.

• Adjustable set points – factory or field adjustment.

• Versatile mounting – vertical, horizontal, or inverted.

Typical Applications

• Fermenter vessels – overpressure and vacuum protection.

• Purified water tanks – integrity during fill/drain cycles.

• CIP supply systems – surge protection.

• Bioreactors – safety relief for pharma manufacturing.

• Dairy storage – milk and cream tank protection.

In each case, the sanitary safety valve provides reliable protection with hygienic design. The sanitary pressure reducing valve function is achieved through the same modulating relief mechanism.

Installation and Maintenance

• Verify set pressure – confirm calibration to system needs (0.5–2 bar typical).

• Check vacuum set point – ensure activation at correct negative pressure.

• Mount with vent port upward – proper pressure sensing and drainage.

• Inspect seals annually – replace EPDM or FPM if cracked or swollen.

• Perform function test – simulate overpressure and vacuum to verify operation.

This integrated dual‑function design reduces component count, simplifies piping, and ensures reliable tank protection in hygienic processing.

New Type Sanitary Clamp Pressure Vacuum Relief Valve

• We manufacture Sanitary Male Thread Vacuum Pressure Valve, Hygienic Tri-Clamp Breather Valve, Stainless Steel Vacuum Relief Safety Valve, Sanitary Adjustable Vacuum Pressure Valve.
• Used in pressure vessel or pipe system, to ensure the equipment and related instrument security.
• This breathing valve can achieve dual functions of exhalation and inhalation, effectively protecting the system safety of containers and pipelines.
• When pressure is higher than the set pressure(standard 1 bar) can exhaust, otherwise is closed; When the pipe system in vacuum(standard-0.9bar) can automatically open.

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