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1 1/2'' Sanitary Constant Pressure Valves AV-8 AISI-304

1 1/2'' Sanitary Constant Pressure Valves AV-8 AISI-304


AV-8 series constant pressure valve can ensure a stable pressure at both outlet and inlet. It is widely used in separators, heat exchangers, tank systems and other equipments. It also can be used as a relief valve.

Working Principle

Constant pressure valve is remotely operated by compressed air. The operation does not need any sensors; it only requires an air pressure regulator and a pressure gauge on pipeline for monitoring. A unique plunger design can make a rapid response to any pressure changes during the medium flow and changes stem position relatively to maintain the pre-set pressure. When the pressure increases, the valve opens; when the pressure decrease, the valve closes.

Design Standard

  • AV-8 series constant pressure valve complies with DIN, 3A and ISO standards.
  • The valve includes a valve body with seat, valve bonnet, a stem with a diaphragm and a clamp.
  • Constant pressure regulating valve's inlet is 90° angle to the valve bottom, so as to minimize residue and facilitate cleaning. The plunger design allows less liquid flow and higher CIP flow.

Technical Specification

Nominal Pressure:
Max. product pressure: 87psi (6bar)
Max. sterilization temperature: 130°C, dry steam: 121°C (2bar).
Steam must be dry, because condensed water will damage the diaphragm. The diaphragm should be replaced after 100 times samplings or sterilizations.

Technical Parameters

Metal material

Product wetted parts


Comes with material certificate

Other steel parts

AISI 304

Diaphragm material

Upper diaphragm


All material comply with FDA21CFR117.2600

Lower diaphragm



Air pressure

0 ~ 120psi (0 ~ 8bar)

Flow rate

Approximately 7m³/h

End connection


Welded ends:
DIN11850, DIN11851/ SMS/ 3A/ ISO etc.