Since
1942
1942
Non-return valves
Model types Stop Silent AS product family
| Special design? No problem - we manufacture your valve according to your wishes |
Why is the Stop Silent AS non-return valve the best choice...
The cone diaphragm check valves from Lasso Technik AG are FDA-compliant, designed for up to 16 bar and suitable for cold and hot water. They can also be used for oily liquids, gaseous, pasty or sandy media as well as acids and bases.
A backflow preventer not only protects the drinking water system in the house, but also the supply network outside, as the drinking water in the house could potentially be contaminated. In the event of damage, it prevents contaminated water from entering the supply network and endangering other water consumers.
A special feature of the diaphragm non-return valves is the silent and gentle closing of the diaphragm. Water hammer effects are greatly reduced, thus protecting the system. The diaphragm guarantees secure closure and seals reliably even with granular or contaminated media.
In addition, the valve cones act as coarse filters to protect pumps and systems. As the conical diaphragm valves have no mechanically moving parts that could wear out, they offer a long service life.
A backflow preventer not only protects the drinking water system in the house, but also the supply network outside, as the drinking water in the house could potentially be contaminated. In the event of damage, it prevents contaminated water from entering the supply network and endangering other water consumers.
A special feature of the diaphragm non-return valves is the silent and gentle closing of the diaphragm. Water hammer effects are greatly reduced, thus protecting the system. The diaphragm guarantees secure closure and seals reliably even with granular or contaminated media.
In addition, the valve cones act as coarse filters to protect pumps and systems. As the conical diaphragm valves have no mechanically moving parts that could wear out, they offer a long service life.
The valves consist of a valve cone made of stainless steel 1.4404 and a soft rubber diaphragm.
They can be installed either vertically or horizontally. As standard, the valves come with an EPDM diaphragm that is approved for drinking water.
They can be installed either vertically or horizontally. As standard, the valves come with an EPDM diaphragm that is approved for drinking water.
Check valve - Products
Intermediate flange assembly type AS54 DN40 to DN200
From a diameter of 40 mm to 200 mm, we offer a valve that can be mounted between two flanges to save space. It is the unbeatable, cost-efficient solution that can be easily integrated into systems to save space.
Diaphragm check valves
Stop Silent diaphragm check valves close gently and quietly and are therefore installed in residential buildings. Depending on the application, Stop Silent rubber diaphragms are available in different materials.
Type ASEA valve body
The latest member of the AS product family is the Stop Silent type ASEA.
Developed for domestic drinking water connections and industrial applications.
Developed for domestic drinking water connections and industrial applications.
Flanged valve type ASSF DN65 to DN200
From a diameter of 65mm to 200mm, AS flanged valves are manufactured in welded constructions. Easy to integrate into existing systems
Foot valves for Pumps
StopSilent® as a foot valve is often adapted to customer requirements in order to minimize pressure loss. The fine membrane as a sealing element provides additional operational safety.
Cone check valves
Our Stop Silent® cone check valves feature a stainless steel valve cone and soft rubber diaphragm. These check valves guarantee a controlled flow direction and reduce the hammer effect to a minimum.
Diaphragm materials of the non-return valves
Stop Silent check valves are equipped with a diaphragm made of materials that are defined according to its application.
- Silicone membrane check valves (VMQ) for drinking water and food industry can be used at air temperatures up to +210°C, and water temperatures up to +100°C with a cold resistance up to about -55°C / -60°C.
- Non-return valves with ethylene propylene diene (EPDM) rubber membranes for cold and hot water, also suitable for short periods under steam for food sterilization.
- Nitrile rubber diaphragm check valves (NBR) for use in the petrochemical industry, solar technology and thermal coupling pumping systems.
- Viton® fluorocarbon diaphragm check valves for applications in the chemical industry. Has good resistance to acids and excellent resistance to low and high temperatures from -20°C to +220°C.
- Fluorosilicone membrane check valves (FVMQ) have very high heat and cold resistance and excellent resistance to weathering, ageing and ozone.
Installation examples of non-return valves
Simple and quick assembly of the non-return valve, the diaphragm is fixed in the perforated support cone and its sealing lips are placed on the inside surface of the cone. When the pressure increases in the direction of flow, the diaphragm deforms and allows the fluid to pass through. If the flow rate is reduced, the diaphragm returns to its initial position and closes the valve.
Check valve AS NU - DN 25 to DN 100
The AS NU check valve with minimum diameter flange designed to be mounted in a body, calibrated for installation in industrial and sanitary fittings. Sealing is achieved by a seal placed between the body and the edge of the flange.
Check valve AS 41 - DN 25 to DN 200
The AS 41 check valve is used, among other things, in standard flat-sealing screw connections.
Check valve AS 54 - DN 40 to DN 200
The AS 54 check valve is a quick and inexpensive solution that can be retrofitted without modifying the structure that houses the system.
Check valve SFL Flange - DN 40 to DN 200
The SFL check valve with flange is installed in flange bodies with a diameter between 40 mm and 200 mm. The valve is supplied hot-dip galvanized with Rilsan or stainless steel coating.
Check valve MKV multiple plug - DN 150 to DN 600
The MKV multi-cone check valve is installed from 150 mm to 600 mm in diameter and is supplied with stainless steel or Rilsan coating. These valves can also be made entirely of stainless steel.
Download the complete Stop Silent® information brochure:
News - Stop Silent
SWISS MADEAS valve invented in 1942Cone made of 1.4404 / AISI 316LSilent, smooth closingMaintenance-freeLiquid, pasty, gaseous mediaDiaphragms: EPDM, Silicone, NBR, Elastosil, Fluorosilicone, Viton
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Stop Silent® Europe GmbH
Lindenbergstrasse 5
79199 Kirchzarten
Germany