Comeval DIAVAL ST
Category: Valves
SubCategory: DiaphragmValves
Manufacturer: Comeval
Industry:
SubCategory: DiaphragmValves
Manufacturer: Comeval
Industry:
Straight Through Type Diaphragm Valves are linear motion valves, bidirectional, for stopping the flow of the service fluid when necessary, not being suitable for regulation purposes.
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Key product features
- Self draining
- A wide range of diaphragm materials to meet the needs of today’s industrial processes and standards
- Greased for life valve spindle
- Straight-through body design → provides an unobstructed flow path for demanding media.
- Bidirectional isolation → supports flexible installation in process piping.
- Sizes from DN15 to DN300 → covers a broad range of industrial line sizes.
- Multiple body materials → support selection for different mechanical and chemical requirements.
- PFA, FEP, ETFE and elastomer lining options → broaden compatibility choices for aggressive media.
- Wide diaphragm material range → helps match chemical resistance and flexibility to the process.
- Bolted bonnet construction → allows diaphragm replacement without removing the valve body from the pipeline.
The ST valves are of simple and reliable design, diaphragm valves offer secure operation with full leaktight at the plant. The maintenance, when required, is limited to the replacement of the diaphragm, the bolted bonnet design permits to dismantle the valve without removing the valve body from the pipe work.
What is Comeval DIAVAL ST used for?
DIAVAL ST is used for bidirectional isolation of aggressive and abrasive liquids in industrial piping. Its straight-through design is useful where an open flow path is important. The valve is intended for shut-off rather than flow regulation.
How does DIAVAL ST differ from DIAVAL W?
DIAVAL ST uses a straight-through body without a raised weir, while DIAVAL W uses a weir-type body. ST is primarily intended for isolation, whereas W can also be used for throttling. AxFlow can help select the correct type for the application.
Which materials are available for DIAVAL ST?
DIAVAL ST is offered with multiple body, lining and diaphragm material combinations. Current COMEVAL documentation includes PFA, FEP and ETFE linings together with several elastomer and PTFE diaphragm options. Material selection must be checked against the actual process medium and operating conditions.
Which sizes are available for DIAVAL ST?
Current COMEVAL documentation lists DIAVAL ST from DN15 to DN300. Connection and body details vary by configuration. AxFlow can help confirm the required size, material and connection arrangement.
How is DIAVAL ST maintained?
The diaphragm is the main process wear component and is replaced when required. The bolted bonnet design allows access without removing the valve body from the pipeline. AxFlow can assist with diaphragm identification, spare parts and service planning.
