High-Temperature Baffle Door
The high-temperature damper valve (also known as high-temperature baffle valve or desulfurization Flue gas…
Hydraulic Slide Gate Valve
The Hydraulic slide gate valve, also known as a hydraulic slide valve, hydraulic gate valve, electro-hydraulic slide gate valve
- ISO 9001:2015
- NDA on request
- 1 pc MOQ
- DDP available
About this part
The Hydraulic slide gate valve, also known as a hydraulic slide valve, hydraulic gate valve, electro-hydraulic slide gate valve, or hydraulically driven gate valve, is a shut-off device that uses hydraulic power to achieve linear movement of the gate plate. It is specifically designed for demanding operating conditions.
- Hydraulic slide gate valves are suitable for:
a. Air, powder, and ash pipeline systems (such as in metallurgy, chemical industry, and power generation)
b. Media containing dust/particulate matter (such as in mines and cement plants)
c. Scenarios requiring rapid shut-off or remote control
d. Pipelines transporting corrosive/abrasive media
- Features of hydraulic slide gate valves:
a. Integrated mechanical, electrical, and instrumentation systems, enabling on-site control, centralized monitoring, or automatic control.
b. No adjustment required, smooth operation, low impact force, suitable for high-pressure applications.
c. Energy-saving, with hydraulic transmission efficiency reaching 80%.
d. The overall structure of the hydraulic slide gate valve is compact and small in size.
e. Any valve position can be controlled and locked.
Main Structural Components of the Hydraulic Slide Gate Valve
Part | Material Options | Function Description |
Valve body | Carbon steel/WCB/304/316L | Fluid flow channel, including flange connections |
Gate | Wear-resistant steel / 304 + carbide | Core shut-off element, hardened sealing surface. |
Sealing components | Fluororubber/metal hard seal | Bidirectional zero-leakage seal |
Hydraulic cylinder | Chrome-plated cylinder barrel + wear-resistant sealing ring | Provides gate valve driving force (≥5MPa) |
Guiding mechanism | Self-lubricating bearings + hardened guide rails | Ensure the accuracy of the gate movement. |
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Technical Parameters of Hydraulic Slide Gate Valve (Example)
Project | Parameter range |
Nominal diameter | DN200 – DN6000 |
Pressure rating | PN10 |
Applicable temperature | -30℃ ~ +450℃ |
Hydraulic system pressure | 5 - 16 MPa (customizable) |
Seal leakage rate | ≤0 |
Opening and closing time | 15 - 60 seconds (adjustable) |
Hydraulic Slide Gate Valve Operating Instructions (Key Steps)
▶ Opening the Valve
System Check: Confirm hydraulic station oil level (≥80%), and that there are no leaks in the pipelines.
Pressure Relief Operation: Open the bypass valve to balance the valve chamber pressure (if configured).
Start the Hydraulic Station: Press the "Open Valve" button → the gate plate rises at a constant speed → automatically stops when in position (limit switch triggered).
Status Confirmation: Visually confirm that the opening indicator shows "Fully Open".
▶ Closing the Valve
Execution of Closing: Press the "Close Valve" button → the gate plate descends at a constant speed.
Seal Testing: After closing, the hydraulic system automatically maintains pressure (pressure holding time ≥ 30 seconds).
Emergency Operation: The manual pump interface supports emergency operation in case of power failure (see Appendix A for details).
Prohibited Actions: Opening or closing under pressure | Use above the design temperature |
Hydraulic Slide Gate Valve Maintenance Procedures
Cycle | Maintenance projects | Standard |
Daily | Hydraulic station oil level/oil temperature check | Oil temperature ≤ 60℃, no emulsification |
Monthly | Sealing surface cleaning + guide groove lubrication | Use food-grade lubricant. |
Year | Hydraulic oil replacement + seal inspection | ISO VG46 anti-wear hydraulic oil |
5 years | Complete disassembly and overhaul (factory repair recommended) | Replace all dynamic seals. |
Troubleshooting Guide for Hydraulic Slide Gate Valves (Quick Reference Table)
Fault symptoms | Possible causes | Solution |
The gate valve is stuck. | Medium crystallization/guide rail deformation | Steam purging of the valve cavity → Rework |
The hydraulic station starts frequently. | Internal leakage in the hydraulic cylinder / Accumulator failure | Replace the seal or accumulator |
Leakage after shutdown | Seal surface damage/Insufficient system pressure | Regrind the sealing surface → Adjust the pressure |
Safety Warnings
Pressure Vessel Risk: The pressure must be released and the hydraulic power source locked out before maintenance.
Electrical Safety: The grounding resistance of the hydraulic station motor must be ≤4Ω (IEC 60204).
Mechanical Hazard: Keep body parts away from the valve's movement area during operation.
Hazardous Medium: Wear appropriate PPE (Personal Protective Equipment) when handling corrosive substances.
Quality documentation included
- Dimensional inspection report (CMM / profile projector) for critical features
- Material certificate with heat number traceability
- Surface finish and hardness records where specified
- Photographic packing record before shipment
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FAQ
Common questions
What products does Lianyungang Huaneng Power Auxiliary Equipment manufacture?
We manufacture power plant dampers (flue gas, desulfurization, high-temperature baffle doors), slide gate valves, blind flange valves, rotary film and sponge iron deaerators, venting silencers, automatic dosing devices, steam-water sampling devices and sampling coolers, coal powder samplers, condensate recovery units, coarse and fine powder separators, and plate / shell-and-tube heat exchangers.
Which certifications does your factory hold?
We are certified to ISO 9001:2015 (quality), ISO 14001:2015 (environmental) and ISO 45001:2018 (occupational health and safety) management systems. We are also a qualified supplier of Sinopec, PetroChina, China Guodian Corporation, China Datang Corporation, CNOOC and Aluminum Corporation of China Limited.
Can you match a damper or valve to our existing ductwork?
Yes — most of our business is retrofit supply. Send us the duct cross-section, design temperature and media, or drawings, templates and photos of the existing installation. Our engineers will dimension the unit, its flange drilling and the actuator interface to bolt directly into your plant.
What leakage performance do your dampers achieve?
Louver-type double-layer dampers with sealing air achieve a leakage rate below 0.5%; fully sealed slide gates and coal mill isolation doors achieve zero internal and external leakage. Every damper is leakage-tested in the works before shipment and a factory acceptance test report is supplied.