Straight-through safety valve

Abstract

The invention relates to a straight-through type safety valve which comprises a valve body, a valve seat, a valve clack, a valve rod and springs. A fixed seat is arranged in a channel center of the valve seat; the lower end of the valve rod is fixedly mounted in an inner hole of the fixed seat; the valve clack is of an inverted bucket type structure; a sealing surface is arranged on the end surface of a cylinder of the lower end of the valve clack; the center of the upper end surface of the valve clack is matched with the valve rod in a motive seal mode; the springs are mounted between the upper end of the valve clack and a spring pressing cover; a guiding circular ring is fixedly mounted on the valve rod in an inner cavity of the valve clack; a piston cavity is formed between the upper end surface of the guiding circular ring and the lower end surface of the valve clack; and flow leakage holes are formed in the plane of the guiding circular ring. The stability of valve clack opening is improved; the opening and closing speed of the valve clack is controlled and adjusted by changing the aperture and number of the flow leakage holes; medium excessive discharging is prevented; the functions of energy saving and throttling are achieved; meanwhile, impact force on the sealing surface of the valve seat when the valve clack returns to the seat is reduced; damage to valve clack sealing surface and the valve seat sealing surface is reduced; the service life is prolonged; and the straight-through type safety valve is suitable for overpressure protection devices of pressure vessels 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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