Views: 0 Author: Site Editor Publish Time: 12-13-2025 Origin: Site
| # | Table of Contents |
| Part 1 | |
| Part 2 | |
| Part 3 | |
| Part 4 | |
| Part 5 | |
| 6 | Conclusion |
| 7 | FAQ |
Proper installation and maintenance are core to maximizing the service life and performance of resilient seated gate valves. This guide, compiled by professional engineers from Tianjin Worlds Valve Co., Ltd., details the complete best practices from pre-installation preparation and standardized operation to periodic maintenance, helping you avoid common pitfalls and ensure pipeline system safety.
Thoroughly cleaning the pipeline before installation is crucial. Slag, rust, or foreign objects inside the pipe can directly damage the valve's resilient seat, causing initial leakage or operational jamming. It is recommended to use high-pressure water or compressed air for purging to ensure a clean installation environment for the valve cavity.
Flow Direction Confirmation: Install the valve strictly according to the flow direction arrow on the valve body. Reverse installation may affect sealing performance and operating torque.
Parameter Verification: Double-check that the valve's nominal pressure (PN/Class) and temperature rating fully comply with the pipeline system's design parameters. Never use a low-pressure valve in a high-pressure system.
Alignment and Gasket: Align the valve with the pipeline flange naturally, avoid forced pulling. Use a gasket of appropriate size and material, and ensure it is centered.
Cross-Tightening Principle: Use a calibrated torque wrench to tighten the bolts evenly in multiple stages following a cross pattern. The final torque value must comply with valve or flange standards (e.g., ISO, ASME). Over-tightening can damage the valve body or gasket.
Manual Operation Test: Before pressurizing the system, manually open and close the valve fully several times to ensure smooth, uninterrupted operation.
Initial Leak Test: Slowly pressurize the system to 1.5 times the working pressure for a strength test, and hold the pressure to check for any visible leaks at the valve body, flange connections, and stem seals. This is the best time to identify installation issues.
Resilient seated gate valves must be used as shut-off valves in either fully open or fully closed positions, and are strictly prohibited for use in throttling/regulating flow. Partially open positions expose the resilient seat to direct erosion and potential tearing by high-velocity fluid, and can cause severe valve vibration.
Slow Operation: Always operate the valve smoothly and slowly. It is recommended to take no less than 5-10 seconds for the full opening or closing process.
Prevent Water Hammer: Rapid valve closure is the primary cause of destructive water hammer (pressure surge). For long-distance water pipelines, follow the principle of "slow, multi-stage closing" or consider installing water hammer arrestors.
Inspection Frequency | Inspection Items |
Monthly/Quarterly | Visual inspection (corrosion, leaks), stem cleaning and lubrication (if applicable) |
Annually | Full functional test (full open/close operation), check flange bolt torque, detailed leak check |
Every 3-5 years or as needed | Overhaul inspection to assess wear on the seat, gate, and stem |
4.2.1 Symptom: Leakage after valve closure
Possible Cause 1: Debris on sealing surface (e.g., grit, slag).
Solution: Slightly open and then fully close the valve several times to flush debris away with the medium. If ineffective, disassemble for cleaning.
Possible Cause 2: Cut or aged resilient seat.
Solution: **Replace the seat assembly with genuine parts**. Worlds Valve provides original spare parts for all valve types, ensuring perfect compatibility.
4.2.2 Symptom: Abnormally difficult valve operation
Possible Cause: Lack of lubrication on stem threads, internal deposits, or valve distortion during installation.
Solution: Check and lubricate the stem (for rising stem designs); check pipeline supports to ensure the valve is not under undue stress.
We are not just a valve manufacturer, but your long-term partner in fluid control systems. We offer:
Full-Cycle Technical Support: From selection consultation and installation guidance to maintenance planning.
Original Warranty & Spare Parts: Ensure you receive compatible and reliable replacement components.
Customization Capability: Provide valve design and manufacturing solutions for special conditions (e.g., high-frequency cycling, special media).
Global Service Network: Supported by certifications like ISO9001, CE, and UKCA, we deliver standardized, high-quality service to customers worldwide.
Adhering to the professional recommendations in this guide can significantly enhance the operational reliability and service life of your resilient seated gate valves, reducing the risk of unplanned downtime. Correct installation, standardized operation, and proactive maintenance are the cornerstones of ensuring the safe and economical operation of your entire pipeline system.
Contact the Worlds Valve technical team today for specialized support or product catalogs.
Q1: Can resilient seated gate valves be used on steam lines?
A1: Generally not recommended. Standard EPDM/NBR rubber seats typically have a maximum working temperature of ≤120°C. For steam service, valves with special high-temperature seat materials (e.g., PTFE) must be selected, and the overall valve design must be confirmed as suitable for steam conditions.
Q2: Does the valve require regular lubrication?
A2: This depends on the valve type. The stem threads of **rising stem gate valves** typically require periodic greasing. The drive nut of **non-rising stem (NRS) gate valves** is enclosed within the valve body and does not require external lubrication. Please refer to the product manual for specifics.
Q3: What should be noted before operating a valve that hasn't been used for many years?
A3: Proceed with extreme caution. First attempt to turn the stem slightly. If severe corrosion is suspected, **do not force it open or closed**. It is advisable to contact a professional, as disassembly, cleaning, lubrication, and testing may be required to ensure safe operation.
