Butterfly Valves. UL listed and labeled. FM approved, 175 psi bronze body, threaded ends, stainless steel disc and stem, two inch maximum pipe size with integral tamper switch, and geared slow-close mechanism.
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.
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. Features of Construction The valves shall be manufactured with integral body seats, suitable for open-closed and throttling service. Each valve shall be capable of withstanding the rated pressure from either side. Leakage rates shall not exceed 3.6cc/hr/cm of nominal valve diameter. The valves shall be furnished with double flanged ends. The valves, where specified or shown on the Drawings, shall be manually operated with gear box and hand wheel and shall be furnished with extension spindles. The extension spindle shall be furnished with a universal coupling and intermediate supports. Butterfly Valves to be installed shall be of the metal seated type generally as per BS EN 593. Valves shall be suitable for mounting in any position. The valve seat shall be of integrally cast and of replaceable design. When the valve is fully closed, the seal shall seat firmly. The seat surfaces shall be machined smooth to provide a long life for the seal. All fasteners shall be set flush so as to offer the least possible resistance to the flow through the valve. All valves shall be suitable for throttling purpose. All valve spindles and hand wheels shall be positioned to give good access for operational personnel. Valve of diameter 400 mm and above shall be provided with an enclosed gear arrangement for ease of operation. The gearing shall be such that the valve can be opened and closed by one man against an unbalanced head of 1.15 times the specified rating. Valve and gearing shall be such as to permit manual operation in a reasonable time and not exceed a required rim pull of 80 N. All hand wheels shall be arranged to turn in a clockwise direction to close the valve, the direction of rotation for opening and closing being indicated on the hand wheels. Butterfly valves conforming to IS 13095 or equivalent International standard are acceptable. Pressure rating for the butterfly valves to be installed in the distribution network shall be as specified in Table 5-1. Table 5-1 Pressure Ratings for Butterfly Valves Service Pressure Rating Operating Pressure (MPa) Body Test Pressure (MPa) Distribution lines PN 1.6 1.6 2.4
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. 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. Butterfly valves shall conform to AWWA C-504. Unless otherwise specified the valves shall be class 150, ductile iron, epoxy coated, stainless steel bolts, shaft seals shall be "O" ring type, the standard opening rotation shall be counter-clockwise and shall have a standard 2" operating nut.
Butterfly Valves. The Contractor removes all old butterfly valves and associated actuators from each clarifier and disposes of them according to the Employer’s waste management procedure. The Contractor supplies and installs new butterfly valves on each clarifier including new gaskets, spacers, brackets, bolts, nuts and washers etc., where required. The Contractor supplies and installs new actuators as specified below using existing power and signal output cables including new glands, gaskets, spacers, brackets, bolts, nuts and washers etc., where required, after which the Contractor calibrates and performs the signal loop checks on them. Only natural rubber gaskets and stainless steel 316 nuts, bolts and flat washers are used. The Contractor supplies the relevant datasheets, material certificates, hydrostatic pressure test certificates, final inspection reports and safety clearance certificates for all valves. The Contractor supplies all relevant datasheets, conformance certificates, stroke certificates and final inspection reports for the actuators. Where actuators need to be installed, the datasheets need to make reference to the torque of the actuator. The rated torque of the actuator shall be 20-30% more than the rated torque of the valve on which it will be installed.
Butterfly Valves. A. Iron body, bronze disc and stem extended for insulated work, resilient replaceable liner seat.
