Design Features And Selection Of Sanitary Threaded Pressure Relief Safety Valves

Install a threaded sanitary pressure relief valve with 304 or 316L stainless steel body to prevent overpressure damage in food and beverage lines. Set the spring-loaded valve to the required pressure (0.5–6 bar). It opens automatically when pressure exceeds the set point, vents excess pressure, and reseats when safe pressure returns. Available in sizes DN25–DN50, operating from -10°C to 120°C. Internal surfaces polished to Ra ≤ 0.8 µm with FDA-compliant EPDM seals.

The Overpressure Threat

Pressure surges from pump startup, valve closure, thermal expansion, or blocked discharge can rupture piping, damage seals, and compromise product integrity. A single overpressure event contaminates product, triggers recalls, and creates unsafe conditions. A sanitary relief valve vents excess pressure before damage occurs.

Spring‑Loaded Relief Operation

The valve uses an adjustable spring to maintain closing force. When system pressure exceeds the set point, inlet pressure overcomes the spring force, lifting the plug and releasing excess pressure through a side outlet. When pressure drops below the set point, the spring reseats the plug, automatically resealing the system.

Key design features:

1. Adjustable spring for precise set pressure (0.5–6 bar)

2. Polished self‑draining body (Ra ≤ 0.8 µm)

3. Open yoke design for visual inspection and cleaning

4. Threaded connection for simple installation

5. EPDM seals (FDA‑compliant for food contact)

Sanitary Construction

The hygienic pressure relief valve features 316L stainless steel wetted parts for corrosion resistance and CIP compatibility. SS304 offers a cost‑effective alternative for less aggressive service. Smooth, crevice‑free surfaces prevent bacterial adhesion; self‑draining body eliminates residue buildup. Threaded connections allow easy installation into existing piping without welding.

Specifications and Selection Criteria

Applications and Selection Considerations

The sanitary air release valve is installed on tanks, vessels, and piping systems to vent trapped air that causes pressure buildup. The sanitary air relief valve is used in CIP supply headers where pressure surges occur. The sanitary safety relief valve provides overpressure protection across the entire process line.

When selecting:

• Set pressure must exceed normal working pressure — 0.1 bar above for working pressures <1 bar, or 10% above for pressures ≥1 bar.

• Size depends on relief capacity — DN25–DN50 covers most food applications.

• Seal material must match process media — EPDM for general food, FKM for oils, silicone for high‑temperature.

• Connection type threaded for simple installation; clamp or weld options available.

Installation and Maintenance

Install vertically with inlet connected to the protected system and outlet to a safe discharge point. The spring is factory‑set but adjustable via the adjustment screw. Inspect regularly—test by manually lifting the plug or applying pressure. The valve supports CIP without disassembly; open yoke design allows visual inspection of plug and seat. Replace seals every 12‑18 months depending on cycle frequency.

This valve design safeguards product quality and equipment in food and beverage facilities where unprotected systems face overpressure risks. The combination of 304 or 316L stainless steel, threaded connection, and adjustable spring‑loaded operation ensures reliable protection without compromising sanitary standards.

Sanitary Stainless Steel Thread Relief Safety Valve

• Hygienic Safety Valve is to adjust the spring compression nut to calibrate a particular pressure. The calibration of pressure is to fix the maximum pressure to avoid the equipment damage. In the normal working operating pressure, the valve is closed. When the system pressure exceeds the systerm and the equipment. The valve is with start the open device for the CIP cleaning of the safety valve and the piping.
• The safety valve is a special valve through a rigorous calibration,but to make the valve more realistic operating conditions, so the conditions shoud be as mush as possible the scene of the valve and then parity.

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