gas butterfly valve Description
Gas butterfly valve is a valve specially used in gas pipeline systems. Its opening and closing parts are disc-shaped butterfly plates, which are driven by the valve stem to rotate 90° to achieve rapid gas shut-off or flow regulation. The core functions include medium cut-off, flow control and system safety assurance, and are suitable for gas media such as natural gas and liquefied petroleum gas (LPG).
Core structure and working principle
Structural composition
Butterfly plate : A disc-shaped flow-blocking component, usually made of stainless steel or carbon steel, with a wear-resistant layer welded on the surface to deal with gas impurities;
Valve body and seal : The valve body is mostly made of ductile iron or cast steel, and the sealing form includes elastic rubber (such as EPDM) or metal hard seal (such as stainless steel + graphite composite layer);
Transmission mechanism : The manual worm gear box or electric actuator drives the valve stem to rotate, and some models are equipped with a reducer to enhance the adjustment accuracy.
Working Principle
The butterfly plate rotates around the valve shaft. When it is open, it is parallel to the pipeline axis, and the gas flow resistance is extremely small; when it is closed, the butterfly plate is perpendicular to the pipeline, completely blocking the medium;
By adjusting the angle of the butterfly plate (15°~75°), the flow rate can be adjusted linearly to meet the needs of different working conditions.
gas butterfly valve Specification
| item | value |
| structure | BUTTERFLY |
| application | General |
| place of origin | China |
| power | Pneumatic |
| customized support | Odm |
| applicable medium | Gas |
| port size | 1/2"-2" |
| warranty | 1 years |
| model number | D671F-16 |
| temperature of media | Normal Temperature |
| brand name | GNEE |
| media | Water gas oil |
Butterfly valves for gas
Features and Advantages
Performance Features
Fast opening and closing: Fully open/closed action can be completed by rotating 90°, with short response time, suitable for emergency cut-off scenarios;
Low flow resistance design: The flow resistance coefficient in the fully open state is only 0.2~0.6, and the pressure loss is much lower than that of the gate valve;
Bidirectional sealing: The butterfly plate and the valve seat adopt an elastic compression structure, which can achieve zero leakage under both positive and negative medium pressures (leakage rate ≤0.01%).
Applicable scenarios
Main pipeline cutoff and pressure regulation of urban gas transmission and distribution pipelines;
Fuel supply control of industrial gas boilers and kilns; Safety isolation and emergency cutoff of gas storage tank stations and gas filling stations.
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