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Blow Down Valves (Piloted Unloader)

Our standard Blow Down Valves come in two body types:

1/4 Blow Down1/2 Blow Down

Application and Description

The valve is normally used to vent a pressurized tank. The valve can also be used to recirculate gas from a high pressure to low pressure system. The valve can have an orifice on the exit so that the flow is controlled. The valve is fully pneumatic so that no spring is present. The valve is piloted to act and the system operates to return the valve. The normally closed blow down valve is commonly used to blow down the air/oil separator tank of a rotary screw compressor. The valve is attached to the tank so the tank pressure keeps the valve closed. To “blow down” the tank the valve is piloted open. The piston is designed so that the pilot pressure is less than the tank pressure. The Blow Down valve is a piloted normally open or normally closed valve.

Air-Con Oil and Gas Applications

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1/4″ BD (Threaded – 1/4 NPTF [Brass or Stainless Steel] BSPP or BSPT [Brass])

Rating

The valve is rated for 250 psi (17.2  bar) maximum pressure and 200°F (93°C) maximum temperature.


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1/2″ BD (Threaded- ½ NPTF [Brass or Stainless Steel] or BPST Inlet/Outlet Ports [Brass], ¼ NPTF [Brass or Stainless Steel] or BPST Pilot Port [Brass])

Rating

The valve is rated for 215 psi (14.8 bar) maximum pressure and 200°F (93°C) maximum temperature.

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