Georg Fischer valves
A complete range of highly engineered corrosion-resistant thermoplastic valves to industrial markets.
Ball valves are used primarily for on-off service but can also be used to provide basic throttling. Flow is controlled by means of a rotating ball with a hole through the center that allows straight through flow in the open position and shuts off flow when rotated 90 degrees. The ball is held in place between two PTFE seats with backing elastomeric o-rings to create a self-adjusting seal and provide constant operating torque. Ball valves are best used with clean fluids as solid particles can cause damage to the ball or seats.
Butterfly valves control flow by using a circular disc with its pivot axis at a right angle to the flow direction. With a short face-to-face dimension, the valves require a minimum of installation space. Two configurations are available: wafer style valves are installed between two mating pipe flanges and lug style valves can be used for dead end service. Butterfly valves are a good choice on-off service and have been used in simple, moderate throttling services.
Diaphragm valves are multi-turn valves that effect closure by means of a flexible diaphragm attached to a compressor. When the compressor is lowered by the valve stem onto a weir, the diaphragm seals and stops the flow. Diaphragms are available in a wide variety of materials to handle corrosive, erosive and dirty services. They are typically used in throttling applications and can also support on-off function.
Check valves are a type of self-actuated valve that are used to prevent backflow. Fluid flow in the desired direction opens the valve while backflow forces the valve closed. George Fischer provides two types of check valves. The ball check valve uses a floating ball that lifts off the seat to permit flow and then reseats using the deadweight of the ball. The Y-check valve is an angle check valve that uses a weighted piston to provide a tight seal. Y-check valves generally have lighter shut-off characteristics than ball check valves at the same pressures.
Pressure regulating valves, or PRVs, are a family of valves used to maintain control over system pressure. All styles of PRV valves operate under the same principle of balancing a spring force against system pressure, but the designs vary slightly to control either upstream or downstream pressure or to relieve system pressure.
Specialty valves offer unique application solutions for a variety of markets. Line strainers, globe valves, ball cock valves, needle valves and tee valves are all available specialty valves