Revised Specifications - the Public Building Commission of Chicago

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PBC Control Rev: 1_09/07/09 PD Project Rev C_07/02/10 3.2 INSTALLATION A. Install valves as indicated, according to manufacturer's written instructions. Ball valves are to be installed where shown on drawings/drawing details as required by Test & Balance Contractor to successfully balance the complete system. B. Piping installation requirements are specified in other Division 15 Sections. Drawings indicate the general arrangement of piping, fittings, and specialties. C. Install valves with unions or flanges at each piece of equipment arranged to allow servicing, maintenance, and equipment removal without system shutdown. D. Locate valves for easy access and provide separate support where necessary. E. Install valves in horizontal piping with stem at or above the center of the pipe. F. Install valves in a position to allow full stem movement. G. For chain-wheel operators, extend chains to 72 inches above finished floor elevation. H. Installation of Check Valves: Install for proper direction of flow as follows: 1. Swing Check Valves: Horizontal position with hinge pin level. 2. Wafer Check Valves: Horizontal or vertical position, between flanges. 3.3 SOLDERED CONNECTIONS A. Cut tube square and to exact lengths. B. Clean end of tube to depth of valve socket with steel wool, sand cloth, or a steel wire brush to a bright finish. Clean valve socket. C. Apply proper soldering flux in an even coat to inside of valve socket and outside of tube. D. Open gate and globe valves to fully open position. E. Remove the cap and disc holder of swing check valves having composition discs. F. Insert tube into valve socket, making sure the end rests against the shoulder inside valve. Rotate tube or valve slightly to ensure even distribution of the flux. G. Apply heat evenly to outside of valve around joint until solder melts on contact. Feed solder until it completely fills the joint around tube. Avoid hot spots or overheating valve. Once the solder starts cooling, remove excess amounts around the joint with a cloth or brush. 3.4 THREADED CONNECTIONS A. Note the internal length of threads in valve ends and proximity of valve internal seat or wall to determine how far pipe should be threaded into valve. B. Align threads at point of assembly. CHICAGO POLICE DEPARTMENT 12 TH DISTRICT POLICE STATION 15100 -6 VALVES PBC-PROJECT# 09070
PBC Control Rev: 1_09/07/09 PD Project Rev C_07/02/10 C. Apply appropriate tape or thread compound to the external pipe threads, except where dry seal threading is specified. D. Assemble joint, wrench tight. Wrench on valve shall be on the valve end into which the pipe is being threaded. 3.5 FLANGED CONNECTIONS A. Align flange surfaces parallel. B. Assemble joints by sequencing bolt tightening to make initial contact of flanges and gaskets as flat and parallel as possible. Use suitable lubricants on bolt threads. Tighten bolts gradually and uniformly with a torque wrench. C. For dead-end service, butterfly valves require flanges both upstream and downstream for proper shutoff and retention. 3.6 VALVE END SELECTION A. Select valves with the following ends or types of pipe/tube connections: 1. Copper Tube Size, 2-1/2 Inches and Smaller: Solder ends, except provide threaded ends for heating hot water and low-pressure steam service. 2. Steel Pipe Sizes, 2-1/2 Inches and Smaller: Threaded, flanged, or grooved end. 3. Steel Pipe Sizes, 3 Inches and Larger: Grooved end or flanged. 3.7 APPLICATION SCHEDULE A. General Application: Use gate, ball, and butterfly valves for shutoff duty; globe and butterfly for throttling duty. B. Domestic Water Systems: Use the following valve types: 1. Gate Valves: Class 125, bronze or cast-iron body to suit piping system. 2. Ball Valves: Class 150, 600-psi CWP, with stem extension. 3. Plug Valves: Neoprene-faced plug, Buna N packing. 4. Globe Valves: Class 125, bronze or cast-iron body to suit piping system, and bronze or teflon disc. 5. Butterfly Valves: Nickel-plated ductile iron, aluminum bronze, or elastomercoated ductile iron disc; EPDM or Buna N sleeve and stem seals. 6. Bronze Swing Check: Class 125, with rubber seat. 7. Check Valves: Class 125, swing or wafer type as indicated. C. Heating Water Systems: Use the following valve types: 1. Gate Valves: Class 150, bronze or cast-iron body to suit piping system. 2. Ball Valves: Class 150, 600-psi CWP, with stem extension and memory stop. 3. Plug Valves: Viton or teflon packing. 4. Globe Valves: Class 150, bronze or cast-iron body to suit piping system, and bronze disc. 5. Butterfly Valves: Nickel-plated ductile iron, aluminum bronze, or epoxy-coated ductile iron disc; EPDM or Buna N sleeve and stem seals. CHICAGO POLICE DEPARTMENT 12 TH DISTRICT POLICE STATION 15100 -7 VALVES PBC-PROJECT# 09070
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Revised Specifications - the Public Building Commission of Chicago

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