DHV 712-R and DHV 718


No compromises in quality and flexibility!

  • Reliable protection from excess pressures in pipe lines
  • Back pressure-free injection and dosing of chemicals
  • Optional certification according to NSF/ANSI 61
  • Safe functioning, even in the case of media with some particle content
  • DN 8 to DN 50
  • Reliable premium quality

ASV Stübbe pressure relief valves have been proving their worth for years in the tough everyday conditions of chemical plant construction. The wide range of varieties opens up diverse application options from use as an overflow valve in a bypass, to safe reduction of pressure peaks in plants with oscillating pumps, to back pressure-resistant injection valves in chemical dosing.

This flexibility is achieved through the interaction of two ideal operating principles:

The patented DHV 712-R with its piston control is unique on the market. Dosing and injection points are easy to implement with the DHV 712-R, as access via the piston makes the valve one hundred percent back pressure-resistant. It combines the functions of a pressure relief valve and a non-return valve.

Unlike competing products, the diaphragm-controlled DHV 718 is purposely not equipped with an additional piston guide, so that media which contain particles can be conveyed without problems.

Of course, both valve ranges are compatible for installation.

In 2014 numerous variations of the DHV 712-R and DHV 718 in PVC were certified according to the American standard NSF/ANSI 61 for drinking water (23° C) by NSF International, the largest testing and certification organisation for water supply systems in the world and are now optionally available with this certification.

Advantages at a glance:

DHV 712-R for premium applications

  • Back pressure-resistant due to the patented piston controls
  • Material range: PVC, PP, PVDF, 1,4571, PFTE
  • Two setting ranges: 0.3 to 10 bar / 0.3 to 4 bar


  • NSF/ANSI-61 certification
  • Pre-set pressures
  • Sealed
  • LABS-free
  • Diffusion stop variations for media which are prone to permeation
  • Pressure gauge preparation / pressure gauge assembly

DHV 718 for price-sensitive systems

  • Diaphragm controlled
  • Material range: PVC, PP, 1,4571
  • Setting range 0.5 to 10 bar


  • NSF/ANSI-61 certification
  • Pre-set pressures
  • Sealed
  • LABS-free 

100 % Series testing across the entire setting range

ETLB-S: Quality, delivery time, flexibility

Why ETLB-S: The "S" in ETLB-S means 'Standard'. 'Standard' represents a restructuring of our ETLB range.

The latest from the C200 series: C200 PROP / C200 DOS are available now

The ASV Stübbe ball valve is now available in two new designs for fine and linear dosing applications.

Ball Valve C100 / Profi 101: Change of Series PROP and DOS

With the completion of the proportional and the dosing ball valve to the new C200 platform the old series C100 PROP and Profi DOS are being replaced...