Industrial Plastic Diaphragm Valves

Asahi industrial plastic diaphragm valves offer many combinations of body and elastomeric diaphragm materials and are abrasion resistant / non-clogging.

When the diaphragm — connected to the valve stem by a compressor — is pulled from the bottom of the valve body, the path of the fluid has a smooth, streamlined flow. Slurries at low pressure which would normally clog many other valve types, easily pass through a diaphragm valve.

Asahi diaphragm valves isolate the bonnet and working parts from the line fluid; making only the body diaphragm materials a consideration for application compatibility. Furthermore, the valve is a top-entry design, allowing in-line maintenance.

The valve is suitable for throttling and on/off service in applications ranging from water treatment to chemical abrasion processes. Asahi diaphragm valves can be operated manually, electrically, or pneumatically.

The Asahi Type-14 diaphragm valve is available in PVC, CPVC, PP and PVDF and features improved body to bonnet sealing performance, visual position indication, a weir design for excellent throttling capabilities and a built in travel stop to prevent over-tightening and eliminate compressive strain. Bubble tight sealing can be achieved even in tough applications containing suspended particles or slurries.

The valve features a layered EPDM/PTFE diaphragm which can accept the addition of a PVDF gas barrier for aggressive chemicals such as Sodium Hypochlorite. These aggressive chemicals produce an off-gas that can permeate the typical laminated PTFE layer and actually become delaminated in this highly corrosive environment leading to a potentially hazardous situation.

For maximum corrosion resistance, the Type-14 diaphragm valve‘s rugged body and bonnet are manufactured from solid thermoplastic materials and can be pneumatically or electrically actuated.

The Asahi Type 15 Diaphragm Valve is perfect for flow control and use with viscous/slurry lines due its high resistance to clogging. The valve has a uniquely designed body and bonnet, as well as a diaphragm with a sealing design manufactured with computer aided analysis for superior sealing.

The Asahi Type G is the largest diaphragm valve in Asahi’s range and is available in 8 or 10 inch sizes. It is perfect for flow control and use with viscous/slurry lines due its high resistance to clogging.

Diaphragm valves can be a better choice for applications that require tight shut-off and better protection from abrasive or corrosive fluids, as the diaphragm acts as a barrier, separating the fluid from the valve body and stem. However choosing the right valve type for your application can ensure long term operation. Other valve types to consider include: