From Asahi & Polypipe UK
Thermoplastic ball valves perform an on/off or modulating function provided by a flow controlling ball inside the body of the valve. A hole through the centre of the ball connects the inlet and outlet ports of the body which can be opened and closed by rotating the ball 90˚ via the valve handle.
The ball is held in place by PTFE seats that provide permanent lubrication, and keep the valve bubble-tight. They are backed by elastomeric cushions, which provide pressure against the ball and compensate for wear.
Elastomer o-rings are used for the stem and carrier seals to prevent leakage to the atmosphere. In the open position, the flow is straight-through, and there is minimal pressure drop when the porting as the ball is the same size as the inside diameter of the pipe.
Asahi Type 21 / 21a Ball Valve [UPVC / CPVC / PP / PVDF]
Asahi Type-21/21a ball valves are corrosion-resistant, plastic, manual, true-union design, quarter-turn valves with hyperbolic flow characteristics, low pressure drops and reliable sealing.
They offer flow control that is used for on/off applications—typically excellent in clean fluid service applications with little-to-no suspended solids.
True-union ball valves can be lifted from a line without having to move piping, simply by loosening union nuts. Asahi type 21 ball valves can be disassembled and parts can be replaced. They can also be pneumatically or electrically actuated.
|Sizes||0.5 – 6inch (6inch has a 4inch body with venturied ends)|
|Bodies||PVC, CPVC, PP & PVDF|
|Seats||PTFE backed with EPDM or FKM|
|Seals||EPDM or FKM or AFLAS|
|Certification||NSF-61 (PVC/EPDM/FKM models)|
|Models||UPVC & CPVC: socket, threaded & ANSI flanged.
PP & PVDF: IPS & metric (DIN) socket, threaded, butt & ANSI flanged.
Asahi 3-Year Manufacturer Warranty
All Asahi Valves from Fusion Australia come with a 3-year manufacturer warranty—the longest warranty we know of for industrial thermoplastic valves in Australia.
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