A500 Pressure Relief Sustaining Valve

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Standard Specifications

Model Name A500 Pressure Relief Sustaining Valve
Body Material
Ductile Iron
End Connections Flange
Disc Holder Ductile Iron
Nylon Reinforced Rubber
Spring Material
Stainless Steel
Pilot Material Stainless Steel
Stem Material Stainless Steel
Working Temperature -10 ⁰C- 80 ⁰C
Delivery Lead Time 8-12 weeks


A type of Automatic Control Valves that remains close until the inlet pressure exceeds the pilot setting. Under flowing conditions, the pilot reacts to a small changes in pressure to control the valve position by modulating the pressure above the diaphragm. Should the upstream pressure fall below the set-point, the valve close or modulate to ensure that the set-point is maintained.


The product images shown may represent the range of product, or be for illustration purposes only and may not be an exact representation of the product.

  • Top and seat ring guided stem and diaphragm assembly for long life and reliability
  • All iron components are fusion epoxy bonded for corrosion resistance.
  • Easy maintenance without removal from the main line.
  • Nylon reinforced diaphragm for long term service.
  • Drip tight shut off.
  • Globe design for superior control characteristics.
  • Ductile iron bodies for higher strength and durability
  • Corrosion resistant stainless steel seat and disc retainer ring.
  • Various pilots and accessories available for configuration into many different applications.
  • Special V-Port and double chamber are options, please consult factory
  • Meet standards BS EN 1074-5, ISO 5208, BS EN 12266-1, BS EN 558-1

About AFC Valves Malaysia Sdn Bhd

AFC (Alpine Flow Control) is a well-known, top-tier brand of water valve that is created, produced, and distributed globally by AFC Co. Ltd, Suzhou. With over three decades of expertise and experience in manufacturing water valves, AFC Co. Ltd has established itself as a trusted company.

The AFC valve is highly regarded for its innovative product design, superior quality, long-lasting durability, reliable and sustainable high performance, cost-effectiveness, adaptable tailored solutions, dependable product warranty, and exceptional customer care services.

The AFC valve adheres to international standards and specifications for valve quality, ensuring proven high performance and reliability. It is supported by various esteemed certifications and quality approval markings, including ISO9001, FM Approval, UL, CE markings, WRAS approved products, and TUV, further validating the quality of the AFC valve.

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A500 Pressure Relief Sustaining Valve