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VACUUM SERVICE SPECIFICATIONS


LINE CONTROL VALVES 2 1/2" AND SMALLER


BALL VALVES:


Valves shall be rated 600 psi non-shock cold working pressure and will have 2-pc. cast bronze bodies, TFE seats, standard port, separate packnut with adjustable stem packing, anti-blowout stems and chrome-plated brass/bronze ball. Where pressure drop is a concern, full-port ball valves of like construction are to be used. Valve ends shall have full depth ANSI threads or extended solder connections and manufactured to comply with MSS-SP110.


CHECK VALVES:


2 1/2" and smaller shall be Y-pattern swing-type manufactured in accordance with MSS-SP80, Class 125, bronze ASTM B 62 body with TFE seat disc or spring-actuated lift-type with resilient seating. Valve ends may be threaded or solder-type


LINE CONTROL VALVES 2 1/2" AND LARGER


BUTTERFLY VALVES:


Valves shall be lug or I.P.S. grooved body style manufactured in accordance with MSS-SP67; 2"-12" rated at least 200 psi non-shock cold water working pressure, 14" and larger rated at 150 psi. Body to have 2" extended neck for insulating and to be cast iron or ductile iron. Valve to have plated ductile iron or aluminum bronze alloy disc with Buna-N rubber seat and seals; or Buna-N rubber encapsulated disc with polymer-coated body. Stem shall be 400 series stainless steel and shall not have exposed stem to disc fasteners. Sizes 2 1/2"-6" shall be lever-operated with 10-position throttling plate; sizes 8" and larger shall have gear operators. Lug-style shall be capable for use as isolation valves and recommended by manufacturer for dead-end service at full pressure without the need for downstream flanges. Lever-operated valves shall be designed to be locked in the open or closed position.


CHECK VALVES:


2 1/2" and larger shall be wafer-style with stainless steel spring, bronze disc plates, rubber seat, body of cast iron ASTM A 126 Class B or A 48 for use with Class 125/150 flanges.