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VAG Quality

Patented and certified - approved valves

Gate valves and butterfly valves, non-return valves, plunger valves, hollow-jet discharge valves, air valves, control valves, house connection valves and fire hydrants - VAG valves can be found in virtually all water works, power plants and pumping stations as well as in numerous building connection systems. There’s a good reason for that: Numerous successful patent applications and certificates for our company and its products are proof of our know-how and expertise in innovative valve development. However, quality checking comes before the awards. It ensures the durability and functional reliability that you rightly expect from VAG.

Whether high water pressure or extreme temperatures, the material must be the right one. In extensive coating tests as well as pressure, leak-tightness and functional tests we simulate the emergencies that your systems must cope with every day. In addition to mathematical calculations, we carry out specific model trials in our own VAG test field. If necessary, we make use of the capacities of renowned universities.

Coating thickness
Coating thickness

Magnetic inductive test to determine the thickness of coatings or corrosion-inhibiting coating agents.

In the picture: Test according to GSK guidelines (Quality Association for the Heavy Duty Corrosion Protection of Powder Coated Valves and Fittings) minimum coat thickness > 250 µm.

Adhesion testing
Adhesion testing

The pull-off test (DIN EN ISO 4624) is used to test how well the coating is bonded to the raw material. Minimum adhesion > 12 N/mm2.

Impact testing
Impact testing

A pendulum that falls through a fixed distance is used for impact testing. The pendulum hits the coated surface with an energy of 5 Nm. The coating may neither crack nor peel.

Porosity testing
Porosity testing

The coating is checked for freeness from porosity using a high-voltage test device at a defined test voltage. The test is performed using a rubber electrode.

Infiltration testing
Infiltration testing

The cathodic infiltration test is a corrosion test according to GSK guidelines and DIN 30677 that is carried out over a test period of 30 days at 23 °C. A defect is created on the coated surface of the test specimen, which is subjected to cathodic polarisation in a sodium chloride solution for the entire test period.

AWWA Proof-of-design Test
AWWA Proof-of-design Test

This proof-of-design test is a durability test according to AWWA C 504-87 with 1,000 load alternations against one-sided pressure. (AWWA = American Water Works Association).

Certificates

Information on ASME Sec. III N-Stamp