Application, Installation And Maintenance Of Sanitary Stainless Steel Exhaust Valves

A sanitary pressure relief valve with an air exhaust function vents trapped gas from the high point of a pipe run. Install it at the high point, set the spring to the line working pressure, and test the vent path before startup. This prevents air locks that stall pumps and cause filling errors. The body uses SS304 or SS316L with a union connection.

How Air Lock Forms and Why It Stalls Flow

Air enters a line during pump start, tank changeover, or CIP drain. The pocket collects at the highest point of the run. Liquid cannot pass the pocket, so the pump loses prime.

A hygienic pressure relief valve at that high point vents the pocket. Once the air leaves, liquid fills the pipe and flow resumes.

• Air collects at the high point of the run.

• A pocket blocks liquid flow.

• The pump loses prime and stalls.

• Venting the pocket restores flow.

Why Air Lock Hurts Filling Accuracy

A partly filled pipe delivers less volume per stroke. Fill heads then over- or under-fill the container. Removing the air pocket keeps the metered volume steady.

Valve Function and Venting Path

The valve holds a spring-loaded plug against a seat. Line pressure above the set point lifts the plug, and air escapes through the outlet.

A sanitary vacuum relief valve works in the opposite direction. It opens when internal pressure drops below atmosphere, letting air in to prevent pipe collapse.

Sizing and Connection Options

The valve size follows the pipe diameter and the air volume to vent. A 1.5 tri clamp pressure relief valve fits common 1.5 inch process lines and headers.

A larger port vents faster but needs more space. Match the port to the expected air volume so the pocket clears within the pump start window. The union connection allows the body to be removed from the line without cutting pipe.

Materials and Surface Finish

Wetted parts use SS304 or SS316L for corrosion resistance against acidic products and repeated SIP cycles. Internal surfaces reach Ra ≤ 0.8 μm.

Electropolishing lowers roughness toward Ra ≤ 0.4 μm and reduces attachment sites for microbes. The valve drains through the outlet when the plug lifts.

Installation and Maintenance Steps

1. Confirm the union size matches the line connection.

2. Mount the valve at the high point of the pipe run.

3. Set the spring to the working pressure of the line.

4. Test the vent path by introducing air into the line.

5. Inspect the seat and spring at scheduled intervals.

Common Applications

Air exhaust valves serve lines that must stay full of liquid. The high-point mount suits headers, risers, and transfer panels.

• Dairy and beverage transfer headers

• Brewery tank outlet risers

• Pharmaceutical solution feed lines

• CIP return line venting

• Food processing fill circuits

Set Pressure and Spring Selection

The spring sets the pressure at which the plug lifts. A setting below the line pressure vents continuously and wastes product. A setting above the pump discharge keeps the valve closed and lets the air pocket persist.

Check the pump curve and the working pressure before choosing the spring. Record the set value on the valve tag so service staff can confirm it later. Replace the spring when the set point drifts, since a weak spring vents early and a stiff spring blocks the vent path.

Sanitary Stainless Steel Air Exhaust Valve

• Our Sanitary Air Exhaust Valve including Sanitary Clamped Air Relife Valve, Hygienic Thread Pressure Relief Safety Valve.
• The series 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 fsysterm 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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