PVDF plastic pneumatic diaphragm valve

Pneumatic diaphragm valves consist of a flexible diaphragm and a pneumatic actuator, which controls the movement of the diaphragm to regulate fluid flow in a piping system. Diaphragm valves can be normally closed (NC), normally open (NO), or double-acting, with different actuation methods to suit various industry requirements.

PVDF Plastic Pneumatic Diaphragm Valve

The pneumatic diaphragm valve stands out due to its robust construction and versatile applications. This valve is available in various sizes, ranging from 1/2″ to 10″ (15mm – 250mm), and comes with different body materials such as UPVC, CPVC, or PVDF. Its diaphragm material varies, with choices like EPDM and EPDM+PTFE. The valve can support pressure supplies up to 5.5 bar and boasts a range of end connections to ensure compatibility with diverse systems.

Mechanism & Structure

The structure of a pneumatic diaphragm valve typically consists of three main components: the valve body, diaphragm, and pneumatic actuator.

Valve Body

The valve body houses the flow channel and connects to the piping system through flange ends or pipe threads. It can be made of various materials, with popular choices being WCB, SS316, SS316L, and body plus rubber lined with PFA or PTFE.

Diaphragm

The diaphragm, made of EPDM, EPDM+PTFE, or other materials, creates a seal between the valve body and actuator. It flexes under pressure from the actuator, opening or closing the flow channel depending on the control input.

Pneumatic Actuator

The pneumatic actuator supplies the force to operate the diaphragm. It can be double-acting, single-acting normally closed, or single-acting normally open, with pneumatic accessories that may include a solenoid valve, limit switch box, filter, E/P positioner, and handwheel for manual operation.

Applications & Industries

Pneumatic diaphragm valves have widespread applications across various industries:

1. Pharmaceutical & Biotech: These valves are often used in cleanrooms, laboratories, and sterile processes where precise control of fluid flow is essential.
2. Chemical & Petrochemical: With their corrosion-resistant properties, they can handle a variety of aggressive chemicals in these industries.
3. Food & Beverage: They provide excellent hygienic performance for applications requiring stringent cleanliness and sterility standards.
4. Water & Wastewater Treatment: Their ability to handle abrasive and corrosive fluids makes them suitable for managing water treatment processes.

Size: 1/2″ – 10″ (15mm – 250mm)
Body: UPVC,CPVC,PVDF
Diaphragm Material : EPDM,EPDM+PTFE
Pressure supply: 5.5bar
Pneumatic Actuator: Double acting,Single acting
Ends: Flange
End connections:
ASME B16.34 class 150、ASME B16.34 class 300
DIN PN16、PN20
JIS 10K、20K

Pneumatic Actuator
Control: Double acting,
Single acting normally closed
Single acting normally open
Pneumatic accessories: Solenoid valve, limit switch box , filter, E/P positioner, hand wheel