The plastic diaphragm valve is a special form of a shut-off valve. The biggest difference from other valves is that it adopts a structure without a stuffing box; the rubber diaphragm can make the corrosive medium in the flow channel completely isolated from all driving components, thus eliminating Usually the valve's "run, run, drip, leak" and other disadvantages.
Plastic diaphragm valves use corrosion-resistant plastic seats and corrosion-resistant diaphragms instead of valve core components, and use the movement of the diaphragm to adjust. It is suitable for the adjustment of strong corrosive media such as strong acid and alkali. The plastic diaphragm valve has a simple structure, small fluid resistance, and a larger flow capacity than other types of valves of the same specification; no leakage, and can be used for the adjustment of high viscosity and suspended particle media. The flow characteristic of the plastic diaphragm valve is close to the quick opening characteristic, and it is approximately linear before 60% of the stroke, and the flow rate after 60% does not change much.
The soft rubber diaphragm valve can cut off the medium.
The valve flap opens, the fluid enters the valve body, and the flow resistance is small.
The valve flap closes slowly, the diaphragm begins to deform downward, and the handwheel rotation torque is small.
The valve is closed without leakage, and there is no need to tighten it tightly after the diaphragm is in contact with the valve seat.