Pneumatically operated diesel engine air intake closure valves based on the standard Chalwyn slimfit 3", 5" and 8" butterfly valves with variants for both hazardous and non-hazardous areas. Available in basic flange mounted for or supplied fitted with hose adapters or an integral flame trap housing.

Body and disc manufactured in corrosion resistant hard anodised aluminium with PTFE coating.

PVX-300, PVX-500 & PVX-800
Air pressure must be applied to these PVX valves to open to the engine run position and needs to be maintained between 4 and 8 bar to hold the intake valve fully open whilst the engine runs.

PVX-301, PVX-501 & PVX-801
With no air pressure applied to these PVX valves they will be fully open and the engine may run. To carry out an emergency stop, apply an air pressure of 4 to 8 bar to close the intake shut down valve. The supply pressure must be vented before attempting to re-start the engine.