Common Problems

Common Problems

One-stop Solution for Valve Products

tips for valve stickiness

Release time:

Oct 27,2025

一. Analysis of Common Causes

1. Impurity Blockage

Solid particles, welding slag or rust within the medium may obstruct the throttle orifice or valve core, causing sticking.

Resolution:

• Clean the valve interior to remove impurities.

• Install a pipeline filter upstream to prevent impurities from entering.

2. Mechanical Component Failures

• Valve stem bending, excessive tightness or wear between valve plug and seat.

• Actuator spring breakage, gear wear or loss of limit components.

Resolution:

• Inspect and replace damaged valve stems, plugs or actuator components.

• Regularly lubricate transmission mechanisms to reduce friction.

3. Temperature and Material Issues

• Low temperatures cause stem deformation or seal hardening.

• Differences in linear expansion coefficients between materials (e.g., stainless steel stems and brass valve sleeves).

ReSolutions:

• Employ low-temperature-resistant materials or enhance insulation measures.

• Increase throttling clearance or adopt alternative designs such as sleeve valves.

4. Inadequate Lubrication

• Insufficient or degraded lubricant increases frictional resistance.

Resolution:

• Replace grease at regular intervals, selecting lubricants with strong low-temperature adaptability.

5. Installation or Design Defects

• Improper valve-to-pipeline configuration causing pre-stress.

• Concealed stem structures or fine-pitch threads prone to seizing under temperature fluctuations.

Resolution:

• Optimise installation positioning to prevent inadequate cold compensation in pipelines.

• Substitute with exposed stem structures or adjust thread specifications.

二．Preventive Maintenance and Care Recommendations

1. Regular Maintenance

• Inspect valve stem and plug wear quarterly, and clean debris from the valve cavity.

• Test actuator responsiveness and promptly replace worn springs.

2. Operating Procedures

• Avoid forceful operation when switching valves, particularly in low-temperature environments.

• Periodically rotate valves that have been unused for extended periods by 10° to 15° to prevent rusting.

3. Selection and Design Optimisation

• Select valve body and sealing materials based on medium characteristics (e.g., corrosion-resistant, wear-resistant materials).

• For media prone to clogging, prioritise sleeve valve or angle valve configurations.

三. Emergency Response Procedures

If the valve suddenly seize, try the following steps:

1. Tap the valve body: Gently strike the base of the valve body with a small hammer to dislodge any jammed components.

2. External flushing: Inject gas or steam through the drain port to flush out obstructions.

3. Manual operation: Switch to manual mode and operate slowly, avoiding forced rotation.

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