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Pilot type safety valve

A pilot-operated safety valve and pilot valve technology, applied in the field of safety valves, can solve problems such as reduced service life, corrosion of pilot valve springs, and increased costs, and achieve the effects of small pressure loss, extended service life, and improved stability

Active Publication Date: 2014-10-15
YANGZHONG VALVE FACTORY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the pilot-operated safety valve has the following disadvantages: (1) The piston cavity of the main valve is provided with an outlet, which will discharge the pressure medium in the cavity to the atmosphere, which is easy to cause pollution; (2) The pilot valve spring is arranged at the bottom of the pilot valve, Immersed in the working medium during operation, the pilot valve spring is easily affected by the medium and corroded, which reduces the service life and increases the cost

Method used

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Embodiment Construction

[0014] As shown in the figure, a pilot-operated safety valve includes a main valve 29 and a pilot valve 30, wherein the main valve includes a main valve body 1, a main valve disc 2, a main valve stem 3, and a main valve cover 7 , the main valve spring 9, the piston 5, the piston ring 6, the packing 8 and the conduit 4, the pilot valve includes the pilot valve pressure pipe 10, the pilot valve body 11, the pilot valve disc 12, the pilot valve stem 14, the pilot valve Valve bonnet 15, pilot valve spring 16 and guide sleeve 13; The main valve bonnet 7 is fixed on the top of the main valve body 1 by bolts 17, and the main valve bonnet 7 is provided with a main valve piston cavity 18, so The main valve stem 3 runs through the main valve bonnet 7 and the main valve body 1, and the outer periphery of the main valve stem 3 is provided with a main valve spring 9, a packing 8 and a piston 5 successively from top to bottom, and the main valve stem 3 The bottom end is in contact with the ...

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Abstract

The invention relates to a pilot type safety valve which comprises a main valve and a pilot valve. The main valve comprises a main valve body, a main valve clack, a main valve stem, a main valve bonnet, a main valve spring, a piston, a piston ring, packing and a guide pipe, the pilot valve comprises a pilot valve pressure guide pipe, a pilot valve body, a pilot valve clack, a pilot valve stem, a pilot valve bonnet, a pilot valve spring and a guide sleeve, a pilot valve discharge channel is arranged on the main valve bonnet, and the main valve bonnet and the pilot valve body are connected with each other by bolts to form an integral structure. The pilot type safety valve has the advantages that environmental pollution can be prevented, the service life of the pilot type safety valve can be prolonged, and the cost can be saved.

Description

technical field [0001] The invention relates to a safety valve, in particular to a pilot safety valve. Background technique [0002] Pilot-operated safety valve is a non-direct-acting safety valve. Due to special circumstances such as working conditions and manufacturing permits, pilot-operated safety valves cannot be replaced by other safety valves, and are widely used in petroleum, chemical and other industrial equipment. . Compared with the spring-type safety valve, the pilot-operated safety valve has the following characteristics: (1) It can have good sealing performance at very close to the opening pressure; (2) The sealing is reliable and the maintenance is simple; (3) The action of the valve is not affected by the back The influence of pressure; (4) The opening pressure of the valve can be set during work, which is easy to adjust; (5) The displacement is large and the caliber is large; (6) The pressure can be very high. [0003] However, the pilot-operated safety va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K17/10
CPCF16K17/048F16K17/10
Inventor 陈金龙将建囯张伟
Owner YANGZHONG VALVE FACTORY CO LTD
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