W1, 2, 3 series are of large capacity, light load, welded structure. Suitable for regulation of low pressure gas or liquid, high temperature styles are also available.
W1 series adopt open type of butterfly plate; W2 series plate manufactured into an oval, when the valve is closed, the plate and valve body center plane form an angle of 10 degrees, forming a self-sealing structure; for W3 series, a set of symmetrical distributed back seat rings are used in valve body.
QRM series diaphragm type and QRE series pist
W1 series opening structure;
W2 self-sealing structure;
W3 flat sealing face structure
155~580000
W1: 2%×Cv; W2, W3: 0.5%×Cv