All Type-14 flanged diaphragm valves shall be of solid thermoplastic construction for body and bonnet with molded flanged ends. The valves shall come standard with a position indicator, travel stop (to prevent overtightening) and bonnet O-ring sealing arrangement. The valve shall be weir type with a square bonnet body sealing design and bayonet connection diaphragm (1/2"- 2") or round bonnet body sealing design (2-1/2"- 4”). All PTFE diaphragms shall be supplied with a PVDF gas barrier between the layers of EPDM and PTFE for aggressive chemical service. The face-to-face dimensions shall conform to Type G. PVC conforming to ASTM D1784 Cell Classification 12454-A, CPVC conforming to ASTM D1784 Cell Classification 23567A, PP conforming to ASTM D4101 Cell Classification PP0210B67272, PPG (bonnet only) conforming to ASTM D4101 Cell Classification PP0110M20A21130, and PVDF conforming to ASTM D3222 Cell Classification Type II. PVC, CPVC, PP and PVDF shall be rated to 150psi for elastomeric and PTFE diaphragms at 70º F., as manufactured by Asahi/America, Inc
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Asahi diaphragm valve type 14
• Flanged (ANSI) face-to-face dimensions are equivalent to most commonly used metallic valves • Rugged body and bonnet are of solid thermoplastic for maximum corrosion resistance • Uniquely designed body and bonnet together with diaphragms of new sealing designs by computer dynamic analysis for superior sealing • Weir design for excellent throttling • Bubble-tight sealing, even in applications such as slurries or suspended particles • Bonnet seals to protect internal from corrosive environments • Built-in travel stop to prevent overtightening or compressive strain on diaphragm • Integrally molded bottom stand for simple yet firm panel mounting • Indicator at the top for indication of valve position and prevention of overtightening • PVDF gas barrier, which protects EPDM backing from gas permeation, is standard for all valves with PTFE diaphragm • Low profile • Bayonet structure to connect compressor and diaphragm – Easy diaphragm replacement
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