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Globe Control Valve - Pneumatic

Globe Control Valve - Pneumatic
2Pages

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Sizes: Materials: Model: Stem Seal: Valve Seal: 1/2" – 4" PVC, PP, PVDF and PTFE Flanged (ANSI) PTFE Bellows FKM,, EPDM, PTFE encapsulated FKM Flow Char.: Linear or equal percentage Rangeability: 1: 50 for 1/2" – 3", 1: 30 for 4" Temp. Range: PVC 32– 140º F, PP -5 – 175º F PVDF -5 – 265º F, PTFE -5 – 284º F Pneumatic Globe Control Standard Features (Sizes 1/2" - 4") • Precise flow control • Solid thermoplastic valve body provides excellent corrosion resistance • PTFE bellows stem seal eliminates old style packing glands and minimizes maintenance • Positive bubble-tight shut-off • Plug and seat can be changed to accommodate a variety of valve coefficients (Cv) • Plug (trim) can be characterized (linear or equal percentage) per requirements. (See below) • No metal to media contact • Extremely corrosion resistant actuator constructed of glass-filled polyester (PEG) with stainless steel trim • Maximum required air pressure is 90psi • 3-15psi direct acting for sizes up to 1" Parts List (Sizes 1/2" – 4") PARTS Description Pneumatic Actuator Polyester Glass Filled (PEG) Actuator Spring Coated Steel BUNA-N (Nitrile) Actuator Valve Stem Actuator Standoffs Position Indicator Nylon Coated Steel Bellows Seal O-Ring Bellows Housing Body O-Ring Seat O-Ring EPDM, FKM, PTFE Encapsulated FKM Valve Seat 3-15psi pneumatic positioner 4-20 mA electro-pneumatic positioner 4-20 mA output transmitter Extra (auxiliary) limit switches Valve Plug Valve Body EPDM, FKM, PTFE Encapsulated FKM EPDM, FKM, PTFE Encapsulated FKM EPDM, FKM, PTFE Encapsulated FKM PTFE Sample Specification All thermoplastic modulating control valves shall be of the globe valve design. Valves shall have interchangeable seat and plugs to accommodate various flow coefficients (Cv) and flow characteristics shall be either linear or equal percentage. Stem seal shall be PTFE and of the bellows design. Pneumatic actuator shall be constructed of glassfilled polyester (PEG) with stainless steel trim. Actuator shall have 1/4" FNPT air connections and a visual position indicator. PVC shall conform to ASTM D1784 Cell Classification 12454-A, PP conforming to ASTM D4101 Cell Classification PP0210B67272, and PVDF conforming to ASTM D3222 Cell Classification Type II, and PTFE shall conform to PTFE TFE 1600, as manufactured by Asahi/ America, Inc. ASAHI/AMERICA RECOMMENDS THE USE OF AV GASKETS FOR THIS PRODUCT LINE • Never remove valve from pipeline under pressure. • Always wear protective gloves and goggles. www.asahi-america.com • asahi@asahi-america.com • Tel: 800-343-3618 • 781-321-5409 • Fax: 800-426-7058 2

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Globe Control Valves PVC/PP Dimensions (in.) NOMINAL SIZE PVDF, PTFE Operating Pressure vs. Temperature (psi, water, non-shock) Troubleshooting What if fluid flows even when fully closed? 1. Plug or seat is damaged. Change plug or seat. 2. Foreign matter caught or formed at plug and seat. 3. Air not completely exhausted. What if it does not open? 1. Actuator diaphragm is damaged or worn. Replace. 2. Operating air pressure is low. What if fluid leaks from body? 1. Bolts for bellows housing and body are loose. Retighten 2. O-ring(s) chemically attacked.

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Globe Control Valve - Pneumatic 2Pages

Catalog excerpts

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Globe Control Valve - Pneumatic
2Pages