Advantages and Installation & Maintenance Methods of Plate Valves

    Sluice gate valves are sliding valves with a closure piece consisting of a parallel gate plate. The closure piece can be a single gate plate or a double gate plate with a lifting mechanism in between. The clamping force exerted on the valve seat by the gate plate is determined by the...

The medium pressure is controlled by a floating gate or a floating valve seat. In the case of a double gate flat gate valve, the support mechanism between the two gates can supplement this clamping force.

Sliding gate valves can be categorized by their drive methods into manual sliding gate valves, pneumatic sliding gate valves, and electric sliding gate valves. They can also be divided according to their application and usage scenarios into sliding gate valves with flow channels and sliding gate valves without flow channels.

Oilfield gate valves, pipeline gate valves, and gas gate valves, etc.

Application Scenarios for Plate Gate Valves:

Petroleum transportation pipelines (Class 150-900/PN 1.0-16.0 MPa, operating temperature -29 to 121°C). Plate gates with guide holes are also convenient for pipeline cleaning.

2. Product oil transportation pipelines and storage equipment.

3. Oil wellhead equipment, also known as the production tree valves.

4. Pipeline for media containing suspended particles.

5. Urban gas transmission pipeline.

6. Water Supply Project

The advantages of flat sliding gate valves primarily include:

  Sealed ReliabilityThe flat gate valve features a floating seat design, enabling bidirectional opening and closing while ensuring reliable sealing. The sealing surface has been specially treated, such as with spray welding of hard alloy, enhancing its erosion resistance.

Thus, ensuring the long-lasting integrity of the seal.

 2. Flexible Opening and ClosingThe design of the flat slide valve ensures a low torque for opening and closing, offering a highly flexible operation. Each gate is equipped with guide strips for precise guidance, ensuring smooth operation.

  3. Easy to operateDue to design optimizations, the operation of the plate gate valve is relatively light, reducing physical effort during operation.

  4. Corrosion and Wear Resistance:The material selection and structural design of the plate gate valve ensure excellent corrosion and wear resistance, making it suitable for various harsh working environments.

  5. Excellent erosion resistanceThe sealing surface has been specially treated for excellent erosion resistance, thereby extending the valve's lifespan.

 6. Innovative DesignThe structural design of the flat gate valve is innovative, offering not only ease of operation but also exceptional performance in corrosion resistance, wear resistance, and erosion resistance, making it an ideal new equipment in the petroleum industry.

‌Installation precautions for flat gate valves mainly include the following aspects:

 ‌ Pre-installation InspectionPrior to installation, a comprehensive quality inspection of the flat gate valve must be conducted. The inspection includes verifying that the valve model and specifications match the design requirements, and checking for any visible damage.

Piston rod misalignment, flexibility, and the integrity of the valve seat's fit with the valve body.

 2. Selection of Installation LocationFlat gate valves cannot be installed horizontally, as the force of gravity will cause the valve stem to act as a cantilever, resulting in flexible deformation. This leads to the valve plate tilting and sinking, thereby creating an unsuitable contact and causing "internal leakage."

  3. Installation Process DetailsDuring installation, it is crucial to ensure that all components of the valve are securely connected, such as gaskets, packing, and bolts, which should be complete and free of defects. Additionally, the valve stem and packing cover should fit properly.

The threads are defect-free, and the valve cover fits well with the valve body.

The maintenance of flat gate valves primarily includes the following aspects:

  Regular inspections and evaluationsRegular comprehensive inspections of the plate gate valves are conducted to assess their operational condition and wear level. The checks include the integrity and sealing performance of components such as the valve body, cover, stem, gate plate, and sealing rings.

   2. Cleaning and Lubrication:Rinse the valve surface and interior with clean water or a neutral solvent to remove dirt and deposits. Apply lubrication to the friction points such as the valve stem, nuts, and bearings to reduce wear and prevent rust. Choose

Choose lubricants or greases with good compatibility with the medium to avoid causing chemical reactions or contamination.

   3. Seal Performance Maintenance:Regularly inspect the sealing rings or gaskets of valves for signs of wear or aging, and replace them promptly. Ensure that the sealing performance between the valve stem and seat is excellent, with no leakage. For flat gate valves with flow holes,

Ensure the flow holes are unobstructed.

  4. Operation Institution Maintenance:Inspect the flexibility and reliability of operating mechanisms (such as handwheels, electric devices, etc.) to ensure a secure and reliable connection between the operating mechanism and the valve, with no signs of loosening. For electric devices,

Further inspection is required to ensure that the power lines and control systems are functioning properly.

  5. Establish Maintenance RecordsDetailed maintenance records are established for each plate gate valve, documenting each maintenance's date, content, and replaced parts, etc. These maintenance records aid in tracking the valve's operational status and maintenance history.

For future maintenance and replacement reference.

 6. Develop Maintenance PlansBased on the frequency of use, working environment, and degree of wear of the gate valve, a reasonable maintenance plan should be formulated. This plan should include key steps such as regular inspections, cleaning, lubrication, and replacement of seals.

Ensure the strict enforcement of maintenance plans to avoid any omissions or delays in maintenance work.

  7. Training OperatorsTraining operators on the structure, working principle, and maintenance knowledge of plate gate valves to enhance their skill levels and safety awareness, ensuring they can operate and maintain the plate gate valves correctly.

Encourage operators to promptly report any issues or anomalies with valve operation for timely handling and maintenance.

  8. Embracing Advanced Detection TechnologyUtilizing advanced technologies such as ultrasonic testing and magnetic particle inspection to inspect and evaluate plate gate valves, we've identified potential defects and wear conditions, providing precise data support for maintenance and repair.