AB Valves GmbH products

MIRAB Butterfly valves are used for fluids such as raw water, drinking water, waste water, compressed air and neutral gases at temperatures up to 70° C and are designed with flow optimization to ensure minimum effects on the flow when the valve is open. This ensures that the whole system can be operated, with the lowest possible head loss coefficient. The valve discs of MIRAB butterfly valves are supported in the body with double eccentricity and Low friction bearings provide maximum radial support for higher shaft loads. 

This valve is equipped with a bypass system and an on/off valve. bypass system is used for connecting both side of the disk for special applications . The usual diameter of bypass valve is approximately 1/10 of nominal diameter of main valve . For installation of bypass the face to face of the main valve is increased.

Product group : Butterfly Valves (BV)ØŒ  Fields of application : Water transmissionØŒ Industrial applicationsØŒ Dams and hydropowerØŒ Water Distribution networkØŒ  Medium : Sea waterØŒ Raw waterØŒ Drinking waterØŒ  Body : Aluminum Bronze ØŒ Stainless SteelØŒ Carbon steel, low alloy steelØŒ Ductile Cast IronØŒ Nickel Aluminum BronzeØŒ  Disc : Stainless SteelØŒ Carbon steel, low alloy steelØŒ Nickel Aluminum BronzeØŒ Aluminum BronzeØŒ 

Product group : Butterfly Valves (BV)ØŒ  Fields of application : Industrial applicationsØŒ Water transmissionØŒ Sewage and TreatmentØŒ  Medium : WastewaterØŒ Sea waterØŒ  Body : Carbon steel, low alloy steelØŒ Ductile Cast IronØŒ 

Knife type gate valves are designed for top performance and a long maintenance free lifetime. They can be found in various industries. The stainless steel knife gate valve is a highly precise manufactured valve, designed for a tight closure of mainly mediums with a more heavy consistency. Its knife-like edge cuts through heavy or high viscous fluids. Knife edges are machine chamfered to reduce packing wear. The brass stem nut makes opening and closing the valve smooth and speedy, with low torque requirements. Knife gate valves can be mounted as “wafer type” between two pipe flanges. Because of its special design there is very little friction between the moveable parts and the body.

Flanges : DIN EN 1092 – 2 (DIN 2501). Face to Face : DIN EN 558 – 1 series 14/15 (DIN 3202 – F4 & F5).

Product group : Gate Valves (GV)ØŒ  Fields of application : Power houseØŒ Water treatmentØŒ Water Distribution networkØŒ Water transmissionØŒ IrrigationØŒ Industrial applicationsØŒ 

Mirab produces socket type gate valves for casted pipes, for PVC pipes, and for PVC pipes with clamps. They are used for closing and opening fluid flow. The gate valves, soft sealing type, can be used for fluids up to 70°C such as potable water and untreated water, as well as compressed air per Certificate DVGW-G260 (Other media on request). Application fields are water supplies, dams, water treatment, pumping stations, pipe lines, industries, power plants, waste water and irrigation.

Double chamber, double orifice air valves combine both large orifice and small orifice functions within one unit. The large orifice allows air to be expelled from the system during the filling of a pipeline and admits air back into the system whenever sub-atmospheric pressure occurs. Air is vented from the system until water enters the valve and lifts the float against its seat, ensuring a tight seal. In the event of sub-atmospheric pressure in the system, the water level drops causing the float to fall from its seat and allows the admission of air.

Large orifice air valves are recommended as part of safety system for large diameter and long pipe lines. Under normal condition (positive pipeline pressure) this air valve is fully closed, it serves as vacuum breaker when the internal pressure in the pipe drops to negative value. For example in case of a pipe burst situation with very rapid medium drainage, a huge volume of air is insert to the pipe through the large orifice of the air valve to prevent damages, caving in, or collapse  of the pipes. Once the pressure increases in the pipe line again, the air valve will be closed. A pneumatic damper is located in the valve to adjust the valve’s closing speed in order to avoid damages in the pipe or the valve caused by rapid closing.