Self-locking type ball valve device

Abstract

The invention discloses a self-locking type ball valve device. The self-locking type ball valve device comprises a valve body, a valve element and a valve rod connected with the valve element and further comprises an opening and closing handle, a lock plate, a spring plate and a first locking block, wherein a first limiting groove and a second limiting groove are formed in the vertical part of theopening and closing handle; the lock plate can slide upwards and downwards along the vertical part under the action of external force, and the bottom end of the lock plate is provided with a stop arm; the spring plate is provided with a projection part capable of having elastic deformation; at a first locking working station, the projection part is clamped in the first limiting groove, and accordingly, the stop arm is located at the outer side of the first locking block, so that the first locking block stops the opening and closing handle from rotating by using the shaft center of the valve rod as an axis; when the lock plate is pushed upwards by external force, the projection part has elastic deformation and goes out of the first limiting groove, and the lock plate slides upwards along the vertical part until the projection part falls into the second limiting groove; and at an unlocking working station, the stop arm goes away from the outer side of the first locking block, and the opening and closing handle can freely rotate by using the shaft center of the valve rod as the axis.

Description

technical field [0001] The invention relates to a ball valve device, in particular to a ball valve device used for a long tube air respirator. Background technique [0002] As a kind of respiratory protection equipment, air breathing apparatus has been widely used in heavy industry, sewage treatment, petroleum, chemical industry, shipbuilding and other fields, and is used by firefighters and related staff to deal with harsh operations such as fire, leakage of harmful substances, smog, and lack of oxygen. On-site, so as to carry out fire source detection, fire extinguishing, disaster relief, rescue and rescue work. [0003] Long-tube air respirator is a special application of air respirator. Its working principle is: with compressed air as the air supply source, when the cylinder valve is opened, the high-pressure air stored in the cylinder enters the decompression through the cylinder valve. The high-pressure air is decompressed to medium pressure, and the medium-pressure a...

AI Technical Summary

Problems solved by technology

[0004] In this case, due to the influence of the internal medium pressure, the existing push-in connectors are extremely laborious to plug in and out, and there are certain safety hazards in plugging and pulling out the push-in connectors under pressure.

However, if the medium-pressure gas in the long pipe needs to be emptied before plugging and unplugging, firstly, it will cause a lot of waste of gas source, and secondly, it will take a very long time to exhaust. say, extremely unfavorable

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