Novel diaphragm capable of reducing tightening torque of middle flange fastener

Abstract

The invention relates to a novel diaphragm capable of reducing tightening torque of a middle flange fastener. The novel diaphragm capable of reducing the tightening torque of the middle flange fastener comprises a diaphragm body (1), a diaphragm flange face is located on the both sides of the diaphragm body (1) and is connected hermetically to a middle flange assembly, a connecting cavity is formed in the middle part of the diaphragm body (1) and is used for being connected to a valve stem of a diaphragm valve, and a reinforcing rib (2) and a sealing rib (3) are arranged on one side of the diaphragm flange surface on the edge. Compared with the prior art, the novel diaphragm capable of reducing the tightening torque of the middle flange fastener has the advantages that the structure and the function are improved on the basis of the prior matured products, the area of the diaphragm flange is reduced, a bolt hole on the diaphragm is eliminated, the reinforcing rib and the sealing rib are added on the diaphragm flange face, the tightening torque of the middle flange fastener can be reduced effectively, the reliability of the middle flange sealing can be improved, and the service life of the diaphragm can be prolonged.

Description

technical field [0001] The invention relates to a novel diaphragm of a diaphragm valve, in particular to a novel diaphragm capable of reducing the tightening torque of a middle flange fastener. Background technique [0002] At present, the flange sealing pair of diaphragm valve mainly relies on the middle flange of the valve body and the bonnet flange to clamp the diaphragm to realize the sealing of the middle flange; the compression amount of the diaphragm is controlled by adjusting the tightening torque of the fasteners, so that the middle flange sealing pair reaches Required seal preload. However, the flange of this diaphragm is similar in size to the flange in the valve body and is provided with bolt holes, so the sealing area is relatively large, but the effective sealing area is relatively small. The seal pretightening force of the middle flange seal pair is too large, which leads to generally too large tightening torque of the middle flange fasteners. [0003] The s...

AI Technical Summary

Problems solved by technology

At present, the flange sealing area of ​​the diaphragm valve with this structure is relatively large, and the sealing pretightening force of the sealing pair is generally too large, which in turn leads to the large tightening torque of the middle flange fasteners, and the sealing effect is average.

Moreover, in order to meet the requirements of the preload of the middle flange, it is necessary to choose fasteners with larger specifications or fastener materials with higher mechanical properties, resulting in generally high structural design costs and material costs.

[0004] Therefore, in view of this defect of the rubber diaphragm, it is necessary to design a new type of diaphragm structure to solve the problem of excessive tightening torque of the flange fasteners.

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