New type safety valve

A safety valve, a new type of technology, applied in safety valves, safety arrangements, balance valves, etc., can solve the problems of valve opening pressure setting drift, displacement medium temperature increase, strong thermal shock, etc.

Inactive Publication Date: 2002-08-21
川开阀门有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of the integral or split vertical formal installation is that the main spring that plays a controlling role is subjected to the high temperature of the pressure medium for a long time. Due to the high temperature relaxation and deformation of the spring, the opening pressure setting of the valve is easy to drift.
[0006] The disadvantage of the overall flip-chip plus condensate seal is that when the safety valve is activated to discharge high-temperature pressure medium, the body of the main valve will be subject to strong thermal shock, especially for thick-walled valve bodies.
Because the thermal shock stress is proportional to the cube of the valve body wall thickness, as the valve body wall thickness increases, the thermal shock stress value increases rapidly, and the unacceptable thermal shock stress limits the increase of the valve body wall thickness, thereby limiting the valve's performance. The increase of the displacement and the increase of the temperature of the medium used

Method used

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Embodiment Construction

[0024]The structure of the new safety valve provided by the present invention is shown in the left part of Fig. 1, the main valve seat [49] is welded on the main valve body [1], and the main valve disc [2] is covered on the main valve seat [ 49] on. The lower end of the main valve stem [4] is screwed in by the screw plug [3] to connect it to the main valve disc [2], the upper end passes through the piston [8], and the nut [10] is used, and the anti-loosening spring washer [9] is added. ] screwed onto the piston [8]. The piston [8] is placed in the cylinder liner [5]. The main valve preload spring [7] is placed in the groove of the cylinder liner [5], the upper end is in contact with the piston [8], and the lower end is in contact with the bottom of the groove of the cylinder liner [5], and is compressed to a certain extent. The force generated by the compression is transmitted to the main valve disc [2] through the piston rod [4], so that the main valve disc [2] generates an...

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PUM

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Abstract

The new type safety valve as an indirectly acting valve is a superpressure protecting device. It includes three separated parts of one main valve installed in forward direction, one supplementary valve installed in reverse direction and one release controlling valve connected into one integral through pulse pipes with serially connected trap filter. The main valve and the supplementary valve are leakless safety valves and the release controlling valve may be manual, solenoid or pneumatic one. The new type safety valve has simple structure, low manufacture cost, stable performance and long service life.

Description

1. Technical field [0001] The invention relates to a safety valve, especially an indirect-acting safety valve in which the main valve and the auxiliary valve are separately set. [0002] The safety valve is an essential overpressure protection device for all pressure vessels or systems with variable pressure media inside. [0003] The object of the present invention is to provide a new type of indirect acting safety valve especially used in the nuclear reactor overpressure protection system using light water as the reactor coolant. Its working principle is shown in FIG. 1 . When the valve inlet nozzle contains pressure medium water or steam, the medium causes the main valve disc [2] to generate an upward force, which forms together with the force of the main valve pre-tension spring [7] on the main valve disc [2] The sealing force between the main disc [2] and the main valve seat [49] increases with the increase of system pressure (see Figure 3). At the same time, the water ...

Claims

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Application Information

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IPC IPC(8): F16K17/02F16K17/10G05B9/00
Inventor 赵文轩
Owner 川开阀门有限责任公司
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