A bevel gear gate valve is a type of valve that controls the flow of media in a pipeline through mechanical transmission. Its core structure includes a gate (wedge-shaped or parallel), a valve seat, a valve stem, and an external bevel gear assembly. During operation, when the handwheel is manually rotated, power is transmitted via the bevel gear assembly through speed reduction and torque amplification-the small gear drives the large gear, converting the higher speed into a greater torque output to the valve stem.
This design allows the operator to overcome fluid pressure and sealing friction with relatively little force, pushing the valve stem in a linear motion along its axis: when the valve stem rises, the gate disengages from the valve seat passage, allowing the media to pass smoothly; conversely, when the valve stem descends, it forces the gate to tightly adhere to the valve seat sealing surface, cutting off the water flow or other media.
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bevel gear gate valve Technical parameters
Material:Carbon Steel, Stainless Steel, Alloy Steel
Size Range:2″ to 48″ (DN50-DN1200)
Connection Options:Flanged, Threaded (NPT, BSP), Butt Weld,
Working Pressure:Class 150 to Class 1500 (up to 2,500 psi / 172 bar)
Working Temperature:-29°C to 593°C
Sealing Options:Metal-to-Metal, Soft seal
Manufacturing Method:Cast, Forged, Machined
Applicable Medium:Water, Oil, Gas, Steam, Chemical Fluids
Manufacturing Standard:API 600, API 6D or API 598, ASME B16.34
Bevel Gear Gate Valve Core Structure and Working Principle
Transmission Method
Utilizing a bevel gear (spiral bevel gear) transmission mechanism, the bevel gear is rotated via a handwheel or drive device, causing the valve stem to rise and fall vertically, thus controlling the opening and closing of the gate. This design converts horizontal rotational motion into vertical linear motion, making operation easier and suitable for space-constrained environments.
Gate Design
Vertical Movement: The gate moves vertically along the fluid channel, changing the channel cross-sectional area to control flow rate.
Sealing Method: A gapless opening and closing design is used between the gate and the valve seat, supporting bidirectional sealing to prevent media leakage. Some models employ integral rubber sealing or hard alloy welding technology to enhance wear resistance and corrosion resistance.
Valve Body Structure
Flat-bottom Valve Body: The bottom is flush with the pipeline, preventing debris accumulation and suitable for media containing solid particles such as sewage and slurry.
Resilient Gate: Some models use a resilient gate structure, compensating for sealing surface wear through its own deformation, extending service life.
Advantages of Bevel Gear Gate Valve
- Low Fluid Resistance: Because the gate is perpendicular to the fluid direction and the sealing surface is less susceptible to erosion and corrosion from the medium, fluid resistance is low.
- Effortless Opening and Closing: The gear transmission device makes opening and closing the valve easy and effortless.
- Unrestricted Medium Flow: The valve design allows for unrestricted medium flow, without turbulence or pressure reduction.
- Simple Structure: The bevel gear gate valve has a relatively simple structure, good manufacturability, and wide applicability.
- Good Sealing Performance: It uses a pressure self-tightening sealing mechanism, where the medium pressure compresses the wedge-shaped sealing ring to achieve a sealing effect; the higher the medium pressure, the better the sealing performance.
Applications of Bevel Gear Gate Valve
Bevel gear gate valves are widely used in industries such as petroleum, natural gas, chemical, power, steel, and wastewater treatment. In these industries, bevel gear gate valves are mainly used to control the flow of fluid in pipelines, ensuring the safe and stable operation of pipeline systems. For example:
- Petrochemical Industry: Used in pipeline systems for transporting various media to effectively prevent media leakage and ensure production safety.
- Natural Gas Industry: Plays a vital role in natural gas transmission pipelines, ensuring the safe transport of natural gas.
- Water Treatment Industry: Primarily used in pipeline systems of water plants, sewage treatment plants, and other similar facilities; it features low flow resistance and is less prone to clogging.
- Power Industry: Widely used in thermal power plants, nuclear power plants, and other similar facilities' thermal and hydraulic systems.
