Butterfly Valve Classification

- Oct 03, 2018-

By way of connection:


1. Clip butterfly valve.


The butterfly plate of the clip butterfly valve is installed in the diameter direction of the pipe. The valve is fully open.


The clamp butterfly valve has the advantages of simple structure, small volume and light weight. Butterfly valve has two types of seal: elastic seal and metal seal. The elastic sealing valve can be inlaid on the valve body or attached to the periphery of the butterfly plate.


2. Flanged butterfly valve


The flange type butterfly valve is a vertical plate type structure, and the valve stem is an integral metal seal valve sealing ring.


For the composite structure of flexible graphite plate and stainless steel plate, it is installed on the valve body, and the sealing surface of butterfly plate is overlaid with stainless steel. The sealing ring of the soft sealing valve is nitrile rubber and is mounted on the butterfly plate.


3. Lug butterfly valve


4. Welded butterfly valve


Welded butterfly valve is a kind of non-hermetic butterfly valve, widely used in building materials, metallurgy, mining, electric power production process medium temperature < 300 ~nominal pressure of 0.1 Mpa pipeline, to connect, open and close or adjust the amount of medium.


The electric control butterfly valve belongs to a variety of electric valve and electric control valve. The connection mode mainly includes flange type and clamp type. It is an important executive unit in the field of industrial automation control. Installation points of electric regulating butterfly valve two major analysis: installation position, height, inlet and outlet direction must meet the design requirements, pay attention to the direction of media flow should be consistent with the arrow direction marked by the valve body, the connection should be firmly and tightly. The appearance of electric butterfly valve must be inspected before installation. The nameplate of the valve should conform to the current national standard GB12220. Strength and tightness tests should be carried out before installation of valves with working pressure greater than 1.0 MPa and cut off on the main pipe. The qualified rear will be used. In the strength test, the test pressure is 1.5 times the nominal pressure, and the duration is not less than 5 minutes. The valve shell and packing should be qualified without leakage. Electrically operated butterfly valves can be divided into offset plate type, vertical plate type, inclined plate type and lever type according to the structural form; according to the sealing form can be divided into soft sealing type and hard sealing type; soft sealing type generally adopts rubber ring seal, hard sealing type usually uses metal ring seal.