Buffering type safety valve

Abstract

The invention relates to a buffering type safety valve. The buffering type safety valve comprises a valve body, a valve base, a valve clack, a valve rod and a spring. The buffering type safety valve is mainly characterized in that a fixing base is arranged in the center of a channel of the valve base, and the lower end of the valve rod is fixedly installed in an inner hole of the fixing base. Thevalve clack is of an inverted-barrel type structure, a sealing face is arranged on the cylindrical end face of the lower end of the valve clack, and the center of the upper end face of the valve clackand the valve rod are in dynamic sealing fit. The spring is installed between the upper end of the valve clack and a spring compression cover. A circular guide ring is fixedly installed on the portion, located in an inner cavity of the valve clack, of the valve rod, a piston cavity is formed between the upper end face of the circular guide ring and the lower end face of the valve clack, and flowdrainage holes are formed in the plane of the circular guide ring. The opening stability of the valve clack is improved. The hole diameters and the number of the flow drainage holes are changed, the purpose that the opening and closing speed of the valve clack is controlled and adjusted is achieved, media are prevented from being excessively discharged, and the effects of saving energy and throttling are achieved. Meanwhile, the force of impact on a sealing face of the valve base in the process that the valve clack returns is reduced, the damage to the sealing face of the valve clack and the sealing face of the valve base is reduced, and the service life is prolonged. The buffering type safety valve is suitable for overpressure protection devices of pressure containers and pipelines.

Description

technical field [0001] The invention belongs to the field of valves, in particular to a safety valve. Background technique [0002] The existing spring safety valve generally includes a valve body, a valve seat, a valve disc, a valve stem and a spring, etc., the valve seat is fixedly installed in the inner cavity of the valve body, the upper end of the valve seat is provided with a valve seat sealing surface, and the valve disc is installed above the valve seat. The lower end of the disc is provided with a disc sealing surface that can form a seal with the sealing surface of the valve seat. The force formed by the compression of the spring acts on the disc through the valve stem, thereby keeping the sealing surface of the disc pressed against the sealing surface of the seat to form a seal. Yes: After the valve clack is opened, when it is closed again, the impact force of the valve clack on the valve seat is relatively large, which may easily lead to damage to the sealing sur...

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Problems solved by technology

[0002] The existing spring safety valve generally includes a valve body, a valve seat, a valve disc, a valve stem and a spring, etc., the valve seat is fixedly installed in the inner cavity of the valve body, the upper end of the valve seat is provided with a valve seat sealing surface, and the valve disc is installed above the valve seat. The lower end of the disc is provided with a disc sealing surface that can form a seal with the sealing surface of the valve seat. The force formed by the compression of the spring acts on the disc through the valve stem, thereby keeping the sealing surface of the disc pressed against the sealing surface of the seat to form a seal. Yes: After the valve clack is opened, when it is closed again, the impact force of the valve clack on the valve seat is relatively large, which may easily lead to damage to the sealing surface of the valve clack and the valve seat, and affect the service life; the closing speed of the valve clack cannot be adjusted, which is easy to cause If there is too much loss of medium in the container, the energy loss will be large; when the valve disc is opened, it is easy to shake under the action of the discharge medium, which will easily lead to unstable opening and loud noise

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