HV Series Back Pressure Regulators for High Flow

The Equilibar HV Series is a high flow back pressure valve targeted for applications with high flow rates and small differential pressures. A typical application for the HV low pressure valve would be controlling exhaust gasses at 2 to 4 inches of water column pressure. The HV is a pilot operated back pressure valve. The pressure signal applied to the pilot port commands the HV to control its inlet port to that same pressure. This signal to controlled pressure is a precise 1:1 relationship. The pilot pressure may be applied with a manually adjusted mechanical pressure regulator or with an electronic pressure regulator where automation of the pressure control is required.

Part #	Port Size	Pilot Port	Max. Operating Pressure
HV16	2″	1/4″ NPT	10 inWC
HV32	4″	1/4″ NPT	10 inWC
HV48	6″	1/4″ NPT	10 inWC

HV Low Pressure Control Valve Advantages:

Automatically responds to changes in system flow rate
Controls pressures near atmosphere accurately
Able to handle corrosive media and aggressive vapors
Able to control at high temperatures 150ºC/300ºF
Easily and inexpensively field maintained

End Connections

Weld Tube Stub
Pipe Flange – ANSI 150# Class Typical

Body Materials:

SS304 standard
SS316L optionally

Diaphragm Materials:

Viton (FKM)
Buna-N
PTFE
Polyethylene
EPDM

Gasket Materials:

EPDM (std)
Silicone

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Originally designed for ventilation applications, the HV Series can provide precision into the millibar range (down to around 1 inH₂O / 25.4 mmH₂ or 0.03 psig / 2 mbar(g)). The HV valve is able to control accurately at these low pressures because of its unique direct diaphragm sealing design. A thin flexible membrane is the only moving part. This diaphragm is used to directly seal against a field of orifices. There are no internal springs or sliding seals to create internal friction. The diaphragm has a large area which allows it to be sensitive to small changes in system pressure or flow rate. The unique sensitivity of Equilibar’s supple diaphragms give significant advantages over slow-reacting butterfly valves and other control mechanisms. The HV operates quickly and is able to automatically adjust to changes in as little as 10mS.

Like other Equilibar back pressure regulators, the dome-loaded design matches the inlet pressure to the pilot or setpoint pressure applied to the 1/4″ dome port. The unit can be used in either back pressure control, direct vacuum regulating, or in both modes. The unit will match the setpoint pressure provided to the reference port, be it a positive pressure or negative pressure. The HV series can control vacuum through positive pressures in gauge referenced or absolute referenced models.

The HV back pressure valve utilizes welded stainless steel plate metal construction to avoid the higher weight and costs of bar stock or cast body construction. Contact an Equilibar application engineer to configure the best solution for your high flow application.

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