Lever gate valve is a valve that controls the opening and closing of the gate through a lever mechanical transmission mechanism. Its core design integrates the lever principle and the gate valve cut-off function, and is designed for fast operation, high sealing and harsh media conditions (such as particles, slurry or fiber).
1. Structural composition and working principle
Lever drive device
The lever arm and slider mechanism are used to replace the traditional screw drive. The lever is pressed down or lifted by external force (manual or counterweight) to directly drive the gate to move vertically to open and close the valve.
The screw-free structure avoids the risk of slipping caused by the exposure of rotating parts, and is particularly suitable for high-frequency or emergency cutting needs.
Knife-type gate design
The gate is blade-shaped or wedge-shaped, and the edge is designed as an oblique blade or V-shaped cut, which can cut impurities such as fibers and particles to prevent the accumulation of media from blocking the flow channel.
The gate and the valve seat are forced to fit through the bottom wedge-shaped pressing groove, and the sealing effect is enhanced by the medium pressure, which is suitable for high-pressure differential conditions.
2. Core performance advantages
Fast opening and closing and anti-blocking
The lever transmission does not require multiple turns of rotation, and a single operation can complete the full opening/full closing action, and the response speed is significantly higher than that of the traditional handwheel gate valve.
The knife-type gate has excellent cutting ability for high-concentration slurry, mud and other media, and the flow channel is straight without dead angles, reducing the probability of stuck caused by residual media.
Applicable to harsh working conditions
The sealing surface material is mostly made of wear-resistant alloy or hard coating (such as tungsten carbide), which can withstand the erosion and wear of media containing solid particles.
It can be adapted to manual, pneumatic or electric actuators to meet the diverse needs of explosion-proof, corrosive environments or automatic control.
3. Typical application areas
Industrial fluid treatment
Wastewater treatment plants are used to cut off mud pipelines containing fibers and sediments;
The papermaking industry controls pulp transportation to prevent fiber entanglement from causing valve failure.
Energy and mining
Isolate slurry containing high-hardness particles in mine tailings pipelines;
The ash discharge system of thermal power plants quickly cuts off the ash-water mixed medium.
Chemical and Food Processing
Handling crystallized or viscous materials in chemical processes;
Providing reliable cutoff when conveying liquid raw materials containing pulp and particles in the food industry.
4. Selection considerations
Lever gate valves are not suitable for regulating flow, and are only used as fully open/fully closed shutoff valves;
Large-diameter valves require calculation of lever operating force, and if necessary, counterweights or pneumatic auxiliary devices are configured to simplify manual operation.