Diaphragm valve

One. Structure and characteristics

Diaphragm valves can be divided into six types according to their structure: house type, DC type, cut-off type, straight-through type, gate type and right-angle type; the connection form is usually flange connection; according to the driving mode, it can be divided into three types: manual, electric and pneumatic , The pneumatic drive is divided into three types: normally open, normally closed and reciprocating.

1. The fluid resistance is small.

2. It can be used for the medium containing hard suspended solids; since the medium only contacts the valve body and diaphragm, there is no need for stuffing box, there is no problem of stuffing box leakage, and there is no possibility of corrosion to the valve stem.

3. It is suitable for corrosive, viscous and slurry medium.

4. Can not be used in high pressure occasions.

Two. Installation and maintenance

1. Before installing the diaphragm valve, carefully check whether the operating conditions of the pipeline are consistent with the scope of use specified by this valve, and clean the inner cavity to prevent dirt from jamming or damaging the sealing parts.

2. Do not apply grease or oil on the surface of the rubber lining and the rubber diaphragm to prevent the rubber from swelling and affecting the service life of the diaphragm valve. 3 wheels or transmission mechanism are not allowed to be used for lifting, and collisions are strictly prohibited.

4. When manually operating the diaphragm valve, do not use auxiliary levers to prevent excessive torque from damaging the drive components or sealing parts.

5. Diaphragm valves should be stored in a dry and ventilated room. Stacking is strictly prohibited. The channels at both ends of the stock diaphragm valve must be sealed, and the opening and closing parts should be in a slightly open state.