Soft starting valve

Abstract

The invention discloses a soft starting valve which comprises a valve body with an inlet and an outlet; a valve port and a valve core which are opposite are arranged in the valve body, the upper surface of the valve core is connected with a valve rod which can slide up and down in a valve rod guide sleeve; a chamber is arranged in the valve body, a valve cover is arranged on the top of the valve body, the bottom surface of the valve cover is in sealed connection with the valve body and the valve rod guide sleeve; a piston cylinder is arranged in the valve cover, a piston with a piston rod is arranged in the piston cylinder, and the lower end of the piston rod is connected with the valve rod; a first throttling passage is communicated between the chamber and the inlet, a second throttling passage is communicated between the chamber and the top of the piston cylinder, and a third throttling passage is communicated between the top of the piston cylinder and the outlet. The valve body blank parts, the lower end cover, the valve core and other sealing components in the general pressure-reducing valve can be utilized for the soft starting valve product of the invention, therefore, new molds are not needed and the production cost is reduced greatly.

Description

technical field [0001] The invention relates to a valve, in particular to a valve with a soft start function. Background technique [0002] A pressure reducing valve is a commonly used valve element used to reduce the pressure of a fluid. The structure of a direct-acting pressure reducing valve is as follows: figure 1 As shown, an inlet 3 and an outlet 6 are provided on the valve body 1 , a valve port 2 is provided between the inlet 3 and the outlet 6 , the valve core 5 is opposite to the valve port 2 , and the valve core spring 4 bears on the valve core 5 . A diaphragm 11 is provided between the valve body 1 and the valve cover 12 , and the diaphragm spring 13 is pressed against the top of the diaphragm 11 . A valve stem 7 is connected between the diaphragm 11 and the valve core 5, and the elastic force of the diaphragm spring 13 is adjusted to make the diaphragm 11 move downwards. At the same time, the valve stem 7 pushes the valve core 5 to move downwards. A throttling...

AI Technical Summary

Problems solved by technology

[0004] Existing soft start valves are generally independently designed and manufactured products, with a large number of parts, and cannot be used in common with the parts of the pressure reducing valve, requiring special mold manufacturing, which will increase the cost of parts manufacturing and inventory

Such as the Chinese invention patent application CN200710185721.4 discloses such a soft start valve device, which can well realize the soft start function, but the manufacturing cost is relatively high

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