Stainless Steel Plunger Gate Valves

The stainless steel plunger gate valves is a precision shut-off and regulating valve designed with a plunger-type sealing structure. The valve stem drives the plunger vertically to achieve tight shut-off and accurate flow control through a finely machined seat.

Manufactured entirely from stainless steel, the UJ41H series structure offers stable sealing, strong wear resistance, and good corrosion performance. The hard alloy overlay on the sealing surfaces allows the valve to handle viscous media, mildly abrasive fluids, and corrosive process conditions. This design supports long service life in demanding pipeline systems.

Working Principle

The valve controls flow by linear movement rather than rotation:

The stem moves the plunger up and down along the axis.

The plunger and seat form a precision line-contact seal.

Flow throttling is achieved through gradual opening.

Compared with conventional globe valves, the plunger structure reduces leakage risk and improves repeatable regulation accuracy.

Product Features

Precision Plunger Sealing

The matched grinding between plunger and seat ensures stable metal sealing performance, suitable for applications requiring strict shut-off.

Wear and Corrosion Resistance

Key sealing areas are overlaid with Stellite hard alloy, improving resistance to erosion, particles, and high-temperature service.

Full Stainless Steel Construction

Multiple stainless grades are available to match different corrosion levels and temperature ranges.

Wide Temperature Capability

With appropriate packing and materials, the valve can operate across a broad temperature window, supporting both standard and elevated temperature systems.

Flexible Actuation Options

Manual, electric, and pneumatic configurations are available, allowing the valve to fit manual pipelines or automated process control systems.

Technical Specifications

Main Material Configuration

Body & Bonnet

Key Internal Parts

Typical Applications

The stainless steel plunger gate valves is widely used where reliable shut-off and stable throttling are required:

Petrochemical processing lines

Power plant steam and water systems

Metallurgical pipelines

Pharmaceutical production lines

Food processing systems

General industrial fluid control

It performs well in services involving mild particles, viscous fluids, and weakly corrosive media.

Selection Guidelines

Pressure & Temperature

Confirm PN/Class rating according to operating conditions. For high temperature and high pressure, 316 material and higher pressure class are recommended.

Medium Characteristics

For viscous or particle-containing media, verify the wear resistance of the plunger sealing pair. For stronger corrosion, select 316L.

Flange Facing

Match the pipeline flange standard. For high-pressure or hazardous media, MFM or TG facings provide improved sealing reliability.

Actuation Choice

Manual: small to medium size, low operating frequency

Electric/Pneumatic: remote control or frequent regulation

Sealing Requirement

For strict shut-off duty, specify matched grinding of plunger and seat.

Installation and Maintenance

Installation Notes

Verify model, rating, and material before installation

Clean internal cavity and flange faces

Install according to flow direction marking (low-in, high-out)

Check actuator wiring or air supply before commissioning

Maintenance Recommendations

Inspect packing sealing condition regularly

Tighten gland bolts evenly if minor leakage appears

Regrind or replace plunger/seat if sealing performance declines

After long shutdown, manually stroke the valve before restart

Proper maintenance ensures the stainless steel plunger gate valves maintains stable control accuracy and long-term sealing reliability.