Butterfly valve with self-locking device

带自锁装置蝶阀is a specially designed valve mainly used to prevent accidental changes in valve status caused by misoperation or external interference. It is widely used in safety sensitive fields such as fire protection, chemical engineering, and energy.
Its core features and working principle are as follows:

一、 Self locking principle
Mechanical locking structure: Locking is achieved by interlocking the handle with the valve stem gear slot, and the handle can only be rotated by pressing the handle to disengage the buckle. This design can resist valve displacement caused by pipeline vibration or external collision.
Locked state maintenance: After releasing the pressure handle, the spring mechanism automatically resets the slot and locks the valve stem again, ensuring that the valve is stable at the target opening.
2、 State judgment method
Open state: The valve stem is parallel to the pipeline direction (the handle is aligned with the pipeline axis).
Closed state: The valve stem is perpendicular to the direction of the pipeline (the handle is at a 90 ° angle to the pipeline axis).
3、 Core functions and applications
Anti misoperation: After locking, unauthorized personnel cannot directly operate to avoid process interference.
Anti interference: Suitable for scenarios such as fire pump outlet pipes, gas pipelines, etc. that are easily affected by water hammer/vibration.
Security Enhancement: Some models adopt dual mechanical locks or electronic locks to meet the requirements of high-risk environments such as chemical and nuclear power.
4、 Structural characteristics
Basic components: valve body, butterfly plate, valve stem, pressure handle self-locking mechanism, and reset spring.
Upgraded design: Some valves are integrated with worm gear reducers, which can achieve self-locking and precise flow adjustment.
5、 Difference from ordinary butterfly valves
Butterfly valves with self-locking devices rely on a worm gear box to achieve self-locking, while self-locking device butterfly valves provide faster locking response through an independent mechanical buckle structure, and do not require continuous external force to maintain the locked state.
普通蝶阀依赖蜗轮箱实现自锁，而自锁装置蝶阀通过独立的机械卡扣结构提供更快速的锁定响应，且无需持续外力维持锁定状态‌。