Hydraulic gate valve Description
Hydraulic gate valve is a shutoff valve that uses a hydraulic system to drive the gate to rise and fall. It is specially used in industrial pipeline systems that require large torque control, harsh environments or remote operations. Structural features
Hydraulic drive system
Hydraulic cylinder: converts hydraulic oil pressure into linear thrust to push the valve stem up and down (thrust can reach more than 10,000N).
Hydraulic pump station: provides high-pressure oil source (working pressure is usually 0.6-16MPa) and supports remote centralized control.
Buffer design: built-in deceleration device to avoid impact on the sealing surface when the gate is closed.
Valve body and gate
Flow channel design: full-bore structure, flow resistance is close to that of a straight pipe (flow resistance coefficient ≤0.1).
Gate type:
Wedge gate: self-locking seal, suitable for high-pressure conditions (such as PN100);
Elastic gate: compensate for sealing surface wear and extend service life;
Knife-type gate: cuts off fiber/granular media, anti-clogging design. Seal reinforcement: Valve seat is welded with hard alloy (such as STL6), which is resistant to erosion.
Protection and control
Anti-corrosion coating: Valve body is sprayed with ≥250μm epoxy resin, which is resistant to acid and alkali corrosion; Stroke positioner: Precisely control the opening and closing position of the gate (error ≤±1°); Emergency manual device: Manual operation can be switched when hydraulic pressure fails.
Hydraulic gate valve specification
| Parameter | Scope | Illustrate |
|---|---|---|
| Nominal pressure | PN10 ~ PN100 | High pressure type up to 15000Psi (about 103.5MPa) |
| Nominal diameter | DN50 ~ DN600 | Special customization up to DN1800 |
| Applicable temperature | -60℃ ~ 650℃ | High temperature type uses 2520 stainless steel valve body |
| Hydraulic oil pressure | 0.6 ~ 16MPa | Low-voltage starting torque ≥ 200N·m |
| Response time | ≤3 seconds(DN300以下) | 50% faster than electric gate valve |
Applications
| Industry | Applications | Core Requirements |
|---|---|---|
| Oil extraction | Wellhead pipeline emergency cut-off (15000Psi) | High voltage explosion proof, quick response |
| Mining and smelting | Slurry conveying pipeline (containing solid particles) | Knife-type gate is anti-blocking and wear-resistant |
| Wastewater treatment | Sludge cut-off control (DN400 and above) | Large torque opening and closing, corrosion resistant |
| Thermal power generation | High temperature steam pipeline (650℃) | Heat-resistant alloy seal, zero leakage |
Hydraulic gate valve
Advantages
- Super large torque output: The hydraulic thrust is 3-5 times that of the electric actuator, suitable for large-diameter high-pressure pipelines;
- Resistant to harsh environments: IP67 protection level, resistant to dust, moisture, and vibration conditions;
- Explosion-proof safety: No risk of electric sparks, suitable for flammable and explosive places (such as oil fields and chemical plants);
- Precise cutoff control: Hydraulic buffering ensures zero-impact closure of the sealing surface, with a leakage rate of ≤0.01%
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