Working Principle And Application Of Sanitary Clamp-type Constant Pressure Regulating Valve

A sanitary tank bottom valve for constant-pressure regulation should combine corrosion-resistant stainless steel, smooth wetted surfaces, compatible diaphragm materials, and stable pneumatic control. The valve should maintain the required outlet pressure as process conditions change. Material grade, surface treatment, sealing, connection type, pressure range, and cleaning method should be selected as one system.

Why Material Selection Comes First

The valve body and wetted parts must resist the process medium and repeated cleaning cycles. SS304 suits many hygienic applications, while SS316L is often selected where greater corrosion resistance is required.

A tank bottom diaphragm valve also needs suitable surface treatment. Scratches, pits, and uneven machining can retain product residue and increase cleaning time around the valve chamber.

Surface Treatment Priorities

Controlled surface roughness reduces areas where residue can remain.

Smooth internal passages limit pockets around the diaphragm and flow path.

Accurate machining supports consistent diaphragm movement and sealing.

How Constant-Pressure Regulation Works

A sanitary tank bottom valve regulates downstream pressure through a diaphragm and stem assembly. The valve changes its opening according to the pressure condition, allowing the outlet pressure to remain near the preset value.

The referenced configuration uses compressed-air control and a pressure gauge on the process pipeline. Its listed pressure range is 0–8 bar.

Pressure Control Steps

1. Confirm the required downstream pressure.
2. Set the pneumatic control pressure.
3. Monitor the process-line pressure.
4. Check valve response during pressure changes.

The actual set point should remain within the limits of the valve, piping, tank, and connected equipment.

Why Diaphragm Material Matters

The diaphragm separates the process medium from the operating mechanism. Its material must remain compatible with the fluid, cleaning chemicals, pressure, and temperature.

The referenced configuration uses NBR for the upper diaphragm and PTFE+EPDM for the lower diaphragm.

For a tank bottom diaphragm valve, material selection should consider:

• Chemical compatibility
• Cleaning-agent exposure
• Operating temperature
• Pressure cycling
• Diaphragm replacement intervals

Clamp Connection and Tank Installation

The referenced configuration uses a clamp connection and also lists welding as an available connection method. Clamp assembly allows easier removal, while welding creates a fixed connection for permanent piping.

A sanitary tank bottom valve should be positioned so that the outlet, clamp, diaphragm chamber, and nearby piping remain accessible for inspection and cleaning.

Installation Checks

• Match the valve connection with the tank outlet.
• Confirm the intended flow direction.
• Check sealing alignment.
• Reserve space for diaphragm service.
• Verify cleaning-fluid access.

Where Constant-Pressure Control Fits

A sanitary tank bottom valve can regulate outlet pressure downstream of tanks and process equipment where pressure stability affects flow or equipment operation.

The referenced configuration is described for applications involving tanks, separators, heat exchangers, and related process systems.

A constant-pressure control valve should not be treated as a universal relief device. Pressure regulation and overpressure protection are different functions and should be specified separately when both are required.

Reference Specifications

Practical Selection Checklist

Before specifying the valve, the following should be verified:

1. Stainless steel grade
2. Wetted surface condition
3. Diaphragm materials
4. Tank outlet dimensions
5. Required outlet pressure
6. Available air pressure
7. Connection method
8. Cleaning procedure
9. Maintenance clearance

The design principle is to match material, surface finish, diaphragm sealing, and pressure control to the actual process. A well-specified sanitary tank bottom valve can maintain outlet pressure while preserving cleanability and access at the tank connection.

Sanitary Stainless Steel Clamped Constant Pressure Valve

• Constant pressure regulating valve which in its outlet and inlet to ensure a stable pressure, so widely used in separators, heat exchangers, the back of canned systems and other equipments, as well as the relief valve.
• Constant pressure regulating valve series are remotely operated by compressed air, the series of valve operation does not depend on the pipeline transportatjion of products of any sensor, requiring only a compressed air pressure regulator for the devices and a pressure guage on the product pipelines monitor the pressure. A diaphragm/stem system san transport the product of the rapid reponse to any pressure changer and change stem position so theat continue to mantain pre-set pressure valve. When the delivery pressure of the product increases, the valve opens, on thecontrary, the valve closed.

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