Since
1942

Diaphragm check valves up to 16 bar

Diaphragm check valves up to 16 bar especially for cold and hot water, also FDA compliant, oily liquids as well as acids and bases.

Our technical features of diaphragm check valves

The check valves of Lasso Technologie AG are equipped with a diaphragm to prevent the back flow of liquids and gases. When the membrane is closed, only a low noise level is generated and water hammer is avoided. The anti-reflux valve guarantees a reliable closure even with granular liquids (sandy water). In addition, our diaphragm check valves serve as raw filters and thus secure pumps and systems. We guarantee a long product life thanks to the absence of moving mechanical parts subject to wear.

Diaphragm Check Valves - Technical Data

Media: water, oils, acids and bases
Gas velocity: 15 m/sec
Nominal pressure: 16 bar
Sizes: from DN 20 to DN 600
Heat degrees: -20° to +200°C (no steam)
Fluid velocity: 2.5 m/sec.

Hard shell, soft core – Stop Silent is a valve cone out of stainless steel and a high quality rubber diaphragm

Those two main actors do harmonically interact

Stop Silent check valves guarantee the controlled direction of flow and reduce the water hammer effect to a minimum.
The Stop Silent valves consist of two primary components: The valve cone made out of stainless steel and the flexible rubber diaphragm.

The valve cone, which stands out with its extraordinary design, serves as a coarse filter. This filter protects the casing pump as well as the facilities. The gently closing rubber diaphragm persuades through its safe and high sealing characteristics. The valves can bear up to a flood protection strain of 16bar (232.1psi).

Stop Silent valves are distinguished through their light construction technique and their high capacity. In order to guarantee a frictionless service we recommend replacing the rubber diaphragm every five years.

The rubber diaphragm can be replaced easily! Assure yourself and take a look at this short video demonstration.

Diaphragm Check Valves - Applications

Diaphragm check valves of Lasso Technik AG have a wide range of applications

solar technology
Chemical industry
food industry
petrochemistry
process engineering
irrigations

water treatment
groundwater pumps
heating installations
sanitary facilities
fire protection systems
waterworks

Further areas of application for our diaphragm check valves

water supply
cooling water systems
pumping stations
house installation

Manufacturer, dealer, service provider

Diaphragm check valve materials

Our check valves are equipped with a diaphragm whose material is to be selected according to its use

Diaphragm check valves with a Viton® Fluorcarbon diaphragm:

For chemical industry
Acid resistant
Temperature resistant -20 to +220 °C

Diaphragm check valves with a fluorosilicone diaphragm FVMQ:

unalterable over time
temperature-resistant
weatherproof
ozone resistant

Diaphragm check valves with silicone diaphragm VMQ:

Hot air temperatures up to +210°C
Cold resistance down to approx. -60°C
Water temperatures up to 100°C
For food industry and drinking water

Diaphragm check valves with ethylene-propylene-diene rubber diaphragm EPDM:

For hot and cold water
Suitable for steam sterilization for short periods of time

Diaphragm check valves with nitrile rubber diaphragm NBR:

for solar technology
for thermal cogeneration plants
for petrochemistry

Installation examples of Stop Silent

The membrane is fixed in a perforated support cone and its sealing lip rests on the inner surface of the cone. As the fluid pressure increases, the membrane deforms and opens the way for it. When the pressure drops, the diaphragm returns to its original shape and closes the conical diaphragm check valve