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| Asahi / America | Andover, MA | |
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.jpg) | Ball Valves Ball valves perform a quarter turn on/off or modulating function. A flow-controlling ball located within the body of the valve contains a hole through its center along one axis, which connects the inlet and outlet ports of the body. The ball itself is held in place by, and rotates 90º within, PTFE seats. These provide permanent lubrication and keep the valve 'bubble-tight.' They are backed by elastomeric cushions, which provide pressure against the ball and at the same time compensate for wear. Elastomer O-rings are used for stem and carrier seals to prevent leakage to the atmosphere. In the open position, the flow is straight through with minimal pressure drop as long as the porting through the ball is the same size as the inside diameter of the pipe.  | ||||||||
.jpg) | Butterfly Valves The name of this valve comes from the wing-like action of the flow-controlling disc, which operates at right angles to the flow. The disc has about the same diameter as the connecting pipe, and the flow is straight through, with a low pressure drop. Maintenance is easy due to the small number of moving parts. The butterfly valve can be used either as an on/off or modulating type of valve. Asahi butterfly valves are currently installed in leading Aquariums, swimming pools, mines, chemical processing plants, landfills and water and wastewater treatment plants in the United States and Central and South America. Asahi/America has recently developed the advanced Type 57 valve, which has no metal to media or environment contact whatsoever. These valves may be operated manually, electrically, or pneumatically. Asahi offers numerous options for our butterfly valves including stem extensions, gear operators and limit switches. | ||||||||
.jpg) | Gate Valves The gate valve is the most widely used on/off valve for large diameter, full port applications. When the valve is fully open, it allows straight passage through an opening that is essentially the same size as the inside diameter of the connecting pipe, so there is little pressure drop through a gate valve. The valve operates when the hand wheel and stem screw (or electric actuator) move a cylindrical plug, the gate, up and down at right angles to the fluid flow. Traditionally, gate valves are used only for on/off service, but Asahi/America's unique sliding plug design provides a larger seating area than conventional gate valves, so it can be used for throttling. | ||||||||
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