Butterfly Valves Sample Clauses

Butterfly Valves. Features of Construction

Butterfly Valves. Butterfly valves shall be measured on an individual basis on the number of each size valve and box assembly acceptably installed.

Butterfly Valves. Butterfly valves shall be paid for at the unit price per each size butterfly valve and box assembly installed and shall cover the cost for all materials, transportation, labor, equipment, excavation, sheeting and shoring, installation of the butterfly valves including valve box, concrete pad or collar, valve identification disc, valve marker, valve tag, polyethylene encasement, protection of existing utilities, chlorine for disinfection, disinfection, backfilling, backfill material, disposal of unsuitable backfill materials, tamping, testing, densities, utility crossings, dewatering, trench stabilization, clean-up, restoration and all work and materials necessary to install the butterfly valve and place it in service.

Butterfly Valves.  Seat leakage test at rated pressure  Body test pressure at 1.5 times the rated pressure  Disc strength test at body test pressure

Butterfly Valves. 1. Butterfly valves shall be of the tight-closing, rubber seated type, with rubber seat positively locking in place sealing against flow from either direction. Valves shall be hand operated with cast or ductile iron bodies. Valves shall conform to the requirements of AWWA C504, Class 150B, and shall be fusion-bonded epoxy coated per ANSI/AWWA C550. 2. Valves shall have a 2-inch (50 mm) square operating nut and shall be installed with extension stems to extend the operating nut in accordance with the project details. Valves shall open by turning the operating nut counter clockwise unless specified otherwise in the Plans or The Facility Owner’s Standard Specifications. 3. Valve shafts shall be of 304 or 316 stainless steel. 4. Buried butterfly valve end connections shall be installed using restrained mechanical joints. 5. Flanged valves shall be fully faced and drilled in accordance with ANSI Standard B16.1, Class 125. 6. Provide brass identification tag imprinted with “WATER”, valve size, valve type, and direction and number of turns to open. Provide a ¼-inch (8 mm) hole in the brass tag and attach the tag to the end of the locate wire (twist wire around tag). Tag shall be 2-inch (50 mm) diameter and ⅛-inch (6 mm) thick brass with a ¼-inch (8 mm) hole.

Butterfly Valves. Butterfly valves shall be C.I. as per IS 13095-1991 and having C.I. body, epoxy power coated disc, nitrile rubber sheet and all other detail as per requirement. The valves shall be jointed with flanged joints. The specification of the flanges shall be as per I.S.-6392-1971. Valve up to 150 mm diameter shall be either hand lever or cap operated and from 200mm diameter and above shall be gearbox operated.

Butterfly Valves. ‌ 1. All butterfly valves shall be of the rubber seated, tight closing type. They shall meet or exceed performance requirements for water application of applicable recognized standards such as AWWA C504. All butterfly valves shall be approved equal to those named. Both valve ends shall be mechanical-joint, underground, or flanged with 150# flanges inside, per AWWA specifications. Accessories (bolts, glands and gaskets) shall be supplied by the valve manufacturer. All valves must use full AWWA C504 Class 150B valve shaft diameters, and full Class 150B underground-service operator torque rating throughout entire travel, to provide capability for operation in emergency service. All 12 inch or larger valves shall be installed with mechanical joint sleeves to accommodate valve replacement or removal without cutting pipe. 2. The valve body shall be high-strength cast iron, ductile-iron or alloy cast-iron conforming to recommendations in AWWA 504 Sec. 3. Packing shall be suitable for use in potable- water-service applications and shall not contain asbestos or other constituents identified by the USEPA as being unacceptable for contact with potable water. 3. The rated torque capability of each actuator shall be sufficient to seat, unseat, and rigidly hold in any intermediate position the valve disc it controls under the operating conditions specified. Valves shall be capable of easy closure by one main using a standard valve key, even under emergency conditions. All valves shall open left and be equipped with 2-inch standard nut. 4. Each valve shall be capable of meeting all testing and leakage requirements in AWWA C504. Upon request, the manufacturer shall furnish certified copies of the reports covering these tests. 5. Valves approved for interior installations are: ▇▇▇▇▇ 150 psi, AWWA 504, FL., gear operated or Coated Butterfly Dresser “450” or approved equal. a. Valves approved for underground installations are: ▇▇▇▇▇ “Groundhog” 150 psi, MJ gear operated, adj. box or coated butterfly, Dresser “450”, ▇▇▇▇▇▇▇ Link Seal III or approved equal.

Butterfly Valves. A. Butterfly valves used for automatic control shall be lug type rated for 125 psi non-shock water service to 180°F. Valve body shall be ductile iron with B-Nitrite (BUNA N) or EPDM molded seat and seals. B. Disc material shall be cast bronze of aluminum-bronze with ASTM A-492 Type 416SS stainless steel stem and fittings. C. Valves shall be tight close off suitable for end of the line service. D. Butterfly valves used for two position control shall be line size. Valves used for modulating control shall be sized for a minimum 5 psig differential pressure at full flow. Butterfly valves shall not be used for modulating control without specific approval from the engineer. E. Three way valve mixing or diverting configurations shall have factory provided linkage kits specifically manufactured for the piping arrangement and actuator used. Keystone or approved equivalent.

Butterfly Valves. The valves shall be manufactured in accordance with BS 5155 (cast iron and carbon steel butterfly valves for general purposes), as far as is applicable. The Contractor is referred to the Umgeni Water Particular Specification for Double Flanged Butterfly Valves for sizes from 400NB where working pressure does not exceed 40BAR (4000kPa) and the Umgeni Water Particular Specification for Valves. Where conflict exists, the requirements in this specification shall take precedence. Thereafter the Umgeni Water Particular Specification for Double Flanged butterfly valves shall take precedence over the Umgeni Water Particular Specification for Valves The following criteria for construction shall be met:- a) Body Where wafer-lug type butterfly valves are specified, these shall be of the wafer-lug type, with drilled/tapped bolt holes, to allow the valve to be used at maximum working pressures of respectively 20 and 16 bars in terminal positions. This is to allow downstream pipework to be disassembled with the upstream pipework under pressure. Valves designed for to allow the valve to be used at maximum working pressures of 16 bars at terminal positions unless otherwise specified in the drawings or schedule of quantities. Bodies shall be one piece casting Ductile Iron, UTS 400 MPa, YP 250 MPa, (elongational 12%) grade EN GJS-400-15 to BS EN 1563 or equivalent for sizes up to 1500mm. Sizes above shall be of cast steel grade 480 to BS 1504-161. Bodies shall never be in contact with the fluid conveyed and shall be fully protected internally by the resilient seat. b) Disc Shall be cast or stamped, spherically machined and positively splined or keyed internally to the driving shaft. (Use of plinths or bolts is totally prohibited). Selection of the disc material shall be made taking into account the aggressivity of the fluid. (Cupro-aluminium or stainless steel 316 or equivalent).