Valve rod sealing type closed backpressure adjusting type steam security valve

Abstract

The invention provides a valve rod sealing type closed backpressure adjusting type steam security valve which comprises a valve seat, a valve body and a valve cover. An inlet in the lower portion of the valve body is connected with a protected pressure system through a flange, the valve cover is arranged on the upper portion of the valve body, a valve bonnet is arranged above the valve cover, a spring is arranged inside the valve cover, the valve rod and a clamping ring penetrate through a pressing ring, the pressing ring and the clamping ring form a sealing structure, and a lower adjusting ring and an upper adjusting ring are arranged inside the valve body. The valve rod sealing type closed backpressure adjusting type steam security valve has good valve seat sealing performance, motion performance and adjusting performance on the working condition of high temperature and high pressure steam, and does not pollute the external environment. The design of the valve rod sealing type structure, the closed valve body and the closed backpressure adjusting mechanism meets the requirement of minimal overpressure performance parameters, avoids medium leakage, and meets the actual demands of energy conservation, emission reduction and environmental protection.

Description

technical field [0001] The invention relates to a safety valve used for overpressure protection of a pressure system, in particular to a valve stem sealing type closed back pressure regulating steam safety valve. Background technique [0002] At present, safety valves are widely used in various sectors of the national economy such as petroleum, chemical industry, power stations, metallurgy, nuclear power, and national defense. As production efficiency increases, the demand for energy increases accordingly. In order to save energy and improve the efficiency of equipment, the requirements for energy saving and emission reduction are becoming more and more stringent, and the requirements for the performance and sealing of safety valves that provide overpressure protection are more stringent. [0003] In the overpressure protection of high-temperature and high-pressure vessels such as power boilers and ethylene cracking furnaces, the requirements for the action performance para...

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Problems solved by technology

[0005] In order to overcome the disadvantages of poor sealing performance and over-standard performance of the current safety valve on the steam device, and avoid direct discharge of the medium to the outside, the purpose of the present invention is to provide a closed back pressure regulating steam safety valve with a sealed valve stem. Under the condition of high-temperature and high-pressure steam, it has good seat sealing and excellent adjustment performance, so that the safety valve can quickly reach the fully open state after exceeding the set pressure, and the medium is not directly discharged when discharging, which reduces environmental pollution and reduces Eliminate the impact of the spring being directly impacted by high-temperature medium, and improve the stability of the spring

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