Section 15105 CHECK VALVES

Section 15105

CHECK VALVES

PART 1 - GENERAL

1.1 THE REQUIREMENT

A. This section covers furnishing and installing all check valves in the types and sizes shown and specified, complete and operable, including epoxy coating, appurtenances, and accessories, in accordance with the requirements of the Contract Documents.

B. Check valves shall be designed for operation in either horizontal or vertical position.

1.2 RELATED WORK SPECIFIED ELSEWHERE

A. The requirements of the following sections and divisions apply to the Work of this section. Other sections and divisions of the Specifications, not referenced below, shall also apply to the extent required for proper performance of this Work.

1. Section 15100, Valves, General

2. Section 09800, Protective Coating

1.3 REFERENCE SPECIFICATIONS, CODES, AND STANDARDS

A. All Work specified herein shall conform to or exceed the applicable requirements of the referenced portions of the following publications to the extent that the provisions thereof are not in conflict with other provisions of these Specifications.

B. Comply with the applicable editions of the following codes, regulations and standards.

1. Industry Standards:

ASME B1.20.1 Pipe Threads, General Purpose (Inch)

ASME B16.1 Grey Iron Pipe Flanges and Flanged Fittings

ASME B16.5 Pipe Flanges and Flanged Fittings, NPS 1/2 through NPS 24 Metric/Inch Standard

ASTM A 48 Standard Specification for Gray Iron Castings

ASTM A 126 Standard Specification for Gray Iron Castings for

Valves, Flanges, and Pipe Fittings

ASTM B 61 Standard Specification for Steam or Valve

Bronze Castings

ASTM B 62 Standard Specification for Composition Bronze or Ounce Metal Castings

ASTM B 148 Standard Specification for Aluminum-Bronze

Sand Castings

AWWA C508 Swing-Check Valves for Waterworks Service, 2- in. through 24-in. (50-mm through 600-mm) NPS

C. Comply with the applicable reference Specifications as directed in the General

Requirements and Additional General Requirements.

1.4 CONTRACTOR SUBMITTALS

A. Submittals shall be made in accordance with the General Requirements, Additional

General Requirements and as specified herein.

B. Submittals shall be made in accordance with Section 15100, Valves, General.

1.5 QUALITY ASSURANCE A. General:

1. All valves shall be tested in accordance with manufacturer's recommendation and applicable AWWA specifications.

2. Shop Inspection: All valves shall be shop-inspected in accordance with

Section 15100, Valves, General, of these Specifications.

3. Manufacturer with at least five years of experience in the type of equipment or service being provided

1.6 WARRANTY

A. Guarantees and Warranty shall be furnished in accordance with “Warranty” (CONTRACTOR’s Guarantee) of the General Conditions and Section 15100, Valves, General.

PART 2 - PRODUCTS

2.1 SWING CHECK VALVES (3 INCHES AND LARGER)

A. General: Swing check valves for water, sewage, sludge, and general service shall be of the outside lever and weight type, in accordance with AWWA C 508, except as specified below. Valves shall be full-opening, designed for operation in either horizontal or vertical position with a water-working pressure of 175 pounds per inch unless otherwise shown, and shall have a flanged cover piece to provide access to the disc. Valves shall be designed to accommodate dashpots or hydraulic snubbers, which shall be installed on the valve. Ferrous surfaces of valves, 4 inches and larger, that will be in contact with water shall be amine cured epoxy-coated as specified in System No. 100, Section 09800, Protective Coating.

B. Body: The valve body and cover shall be of cast iron conforming to ASTM A 126, with flanged ends conforming to ASME B16.1.

C. Disc: The valve disc shall be of cast iron, ductile iron, or bronze conforming to

ASTM B 62.

D. Seat and Rings: The valve seat and rings shall be of bronze to conforming ASTM B 62 or B 148.

E. Hinge Pin: The hinge pin shall be of stainless steel and keyed to the hinge.

F. Valves shall be equipped with an outside lever and weight. The lever and weight shall be so constructed and so positioned that the valve operates without interference with any piping, supports, or equipment.

G. Dashpot: A bottom-mounted hydraulic dashpot shall be provided to control the opening and closing cycle of the valve to prevent surge and water hammer. The dashpot shall have two control flow rates: (1) 90 percent rapid rate and (2) 10 percent slow rate during shutdown and startup. Each rate shall be infinitely and independently adjustable. The dashpot shall be a self contained oil system separate and independent from the water line media. The oil reservoir for the closing cycle shall be stainless steel and open to the atmosphere with an air breather cap to prevent oil spillage. The oil reservoir for the opening cycle shall be stainless steel and hermetically sealed to contain pressure (air over oil) and be equipped with a 3-inch diameter pressure gauge and pneumatic fill valve.

H. Limit Switches: Provide limit switches where shown on the Drawings. Limit switches shall be manufactured of corrosion resistant material and meet the area classification shown on the Drawings. Limit switches shall be factory wired and manufactured by Eaton, Allen Bradley, or Equal.

I. Manufacturers and Models, Or Equal:

1. M&H Valve Company.

2. Kennedy Valve Mfg. Co.

3. Mueller Company.

2.2 SWING CHECK VALVES (2-1/2 INCHES AND SMALLER)

A. General: Swing check valves for steam, water, oil, or gas in sizes 2-1/2 inches and smaller shall be Y-pattern, suitable for a steam pressure of 200 pounds per inch and a cold water pressure of 300 pounds per inch. They shall have screwed ends, unless otherwise shown, and screwed caps.

B. Body: The valve body and cap shall be of bronze conforming to ASTM B 61 and with threaded ends conforming to ASME B1.20.1.

C. Disc: Valves for steam service shall have bronze discs, and for cold water, oil, and gas service replaceable composition discs.

D. Hinge Pin: The hinge pins shall be of stainless steel. E. Manufacturers, Or Equal:

1. Crane Company, No. 36.

2. Milwaukee Valve Company, No. 508.

3. Stockham Valves and Fittings, Figure B-345.

4. Wm. Powell Company, Figure 560.

2.3 INTERNAL SPRING-LOADED CHECK VALVES (GLOBE STYLE)

A. General: Internal spring-loaded check valves for water pumps, compressors, gas, air, and steam shall be of the full-flow internal spring-loaded poppet type. The valves shall be designed for a water-working pressure of not less than 150 pounds per inch unless otherwise shown. Corrodible ferrous surfaces of valves 4 inches and larger shall be amine cured epoxy coated as specified in System No. 100, Section 09800, Protective Coating.

B. Body: The bodies of all valves in sizes 3 inches and larger shall be of cast iron with

125-lb flanged ends conforming to ASME B16.1 unless otherwise shown. There shall be a positive, watertight seal between the removable seat and the valve body. The stem guide shall be integrally cast with the body, or screwed into the body.

C. Valves smaller than 3 inches shall have bronze bodies with screwed ends conforming to ASME B1.20.1, suitable for a minimum working pressure of 200 pounds per inch, and a temperature of 250 degrees F, unless otherwise shown or specified. The type of bronze shall be suitable for the intended service.

D. Disc and Stem: The disc and stem of all valves in sizes 3 inches and larger shall be of bronze or stainless steel. The stem shall have two-point bearings. The downstream bearing shall have a bronze or other suitable bushing, to provide a smooth operation.

E. Valves smaller than 3 inches shall have discs and retaining rings of Teflon, Nylon, or other suitable material, and stems of bronze, brass, or stainless steel, suitable for the intended service.

F. Seat: All valves for general service at temperatures up to 250 degrees F shall have bubble-tight shutoff with resilient seats of Buna-N, Teflon, or other suitable material. Valves for steam service and temperatures over 250 degrees F shall have metal-to-metal seating of bronze or stainless steel, as recommended by the manufacturer for the specific service condition. All resilient seats shall be firmly attached to the seating ring by compression-molding or other acceptable method.

G. Spring: All valves in sizes 3 inches and larger shall have stainless steel springs, and valves smaller than 3 inches shall have stainless steel or beryllium copper springs, as suitable for the service. The spring tension of the valves shall be designed for the individual pressure condition of each valve.

H. Manufacturers, Or Equal:

1. APCO Valve and Primer Corp., Series 600.

2. CPV Combination Pump Valve Company, Model 20D.

3. VAL-MATIC Valve and Manufacturing Corporation, Series 1800.

2.4 DOUBLE-LEAF CHECK VALVES

A. General: Double-leaf check valves for air and gas service and where shown, shall be of the wafer-type designed to fit between ASME B16.1 flanges for 125-pound rating. The check valve leaves shall be spring-loaded. Flow from one direction shall cause the valve to open, and upon valve shutoff, the spring shall shut the valve leaves before reverse flow starts and at a point of zero velocity, for nonslam closure. The spring-tension of each valve shall be designed for the individual operating condition.

B. Body: The valve body shall be of cast iron with integrally cast seat, rated for minimum 150-pound working pressure at up to 250 degrees F.

C. Leaves: The leaves shall be of bronze, aluminum bronze, or ductile iron, revolving on stainless steel or monel hinge pins with retainers.

D. Seat: The valves shall have resilient seats for bubble-tight shutoff, suitable for temperatures up to 250 degrees F without sticking. The seats shall be Buna-N, Viton, or other suitable material for the intended purpose. The seat rings shall be firmly attached to the body or disc by compression-molding or similar acceptable method.

E. Springs: The springs shall be of Type 316 stainless steel, or Inconel, as best suited for the service condition.

F. Manufacturers, Or Equal:

1. APCO Valve and Primer Corporation, Bulletin 9000.

2. Nibco Inc., Model KW-900-W

3. VAL-MATIC Valve and Manufacturing Corporation, Bulletin 8800.

2.5 SLANTING DISC CHECK VALVES

A. General: Slanting disc check valves for water and sewage service shall have a seating angle of approximately 55 degrees. Valves shall have replaceable seat rings and disc rings. The water passage cross-sectional area shall be equal to the full pipe area. Valves shall have sufficient clearance around the pivot pins to permit free seating of the disc without binding and shall be guaranteed not to stick in the closed position. All slanting disc check valves shall have position indicators and two flanged connections for attachment of dashpots or hydraulic snubbers. The valves shall be designed for a water- working pressure of 150 pounds per inch, unless otherwise specified.

B. Body: The valve body shall be of cast iron conforming to ASTM A 48 or A 126, Class B, with flanged ends conforming to ASME B16.1, Class 125, unless otherwise specified.

C. Disc: The valve disc shall be designed with an "aerofoil" configuration of cast iron or ductile iron, with bronze seating face, except for valves 10 inches or smaller, which shall have solid bronze or aluminum bronze discs. The disc shall be partially balanced with a short travel, to resist slamming.

D. Seat Ring: The seat ring shall be of centrifugally cast bronze, aluminum bronze, or stainless steel, with beveled edges, firmly clamped or screwed into the valve body.

E. Pins: The pivot pins and bushings shall be of stainless steel, bronze, or aluminum bronze, to allow free movement of the disc without binding.

F. Dashpot: A bottom-mounted hydraulic dashpot shall be provided to control the opening and closing cycle of the valve to prevent surge and water hammer. The dashpot shall have two control flow rates: (1) 90 percent rapid rate and (2) 10 percent slow rate during shutdown and startup. Each rate shall be infinitely and independently adjustable. The dashpot shall be a self contained oil system separate and independent from the water line media. The oil reservoir for the closing cycle shall be stainless steel and open to the atmosphere with an air breather cap to prevent oil spillage. The oil reservoir for the opening cycle shall be stainless steel and hermetically sealed to contain pressure (air over oil) and be equipped with a 3-inch diameter pressure gauge and pneumatic fill valve.

G. Manufacturers, Or Equal:

1. APCO/Valve and Primer Corporation, Model 800T.

2. VAL-MATIC Valve and Manufacturing Corporation, Bulletin 7200, SurgeBuster.

2.6 PLASTIC BALL CHECK VALVES

A. General: Plastic ball check valves for corrosive fluids, in sizes up to 4 inches, shall be used for vertical upflow conditions only, unless the valves are provided with spring actions.

B. Construction: The valve bodies and balls shall be of chlorinated polyvinyl chloride (CPVC) or Teflon/PTFE construction, as best suited for each individual service condition and as approved by ENGINEER. They shall have unions with socket connections, or flanged ends conforming to ASME B16.5, class 150. All seals shall have Viton or Teflon O-rings, as best suited for each individual service condition and as approved by ENGINEER. Valve design shall minimize possibility of the balls sticking or chattering. The valves shall be suitable for a maximum working non-shock pressure of 150 pounds per inch at 73 degrees F.

1. Ball check valves for sulfuric acid service shall be TEFE with no metal components and shall be installed in upflow direction.

C. Manufacturers, Or Equal:

1. ASAHI/America.

2. Spears Mfg, TU2000-2-0408.

3. Hayward Flow Control.

2.7 PLASTIC SWING CHECK VALVES

A. General: Plastic swing check valves for corrosive fluids, in sizes up to 8 inches, may be used for horizontal or vertical upflow conditions.

B. Construction: The valve bodies and discs shall be of PP, or PVDF construction, as best suited for each individual service condition. They shall have flanged ends conforming to ASME B16.5, class 150, and flanged top access covers, and they shall shut positively at no-flow conditions. The seats and seals shall be of EPDM, Teflon, or Viton as best suited for each individual service condition and as approved by ENGINEER. The valves shall be rated for a maximum non-shock working pressure of

150 pounds per inch at 73 degrees F for sizes 3 inches and smaller. For larger sizes and other materials and temperatures the pressure rating will be lower.

C. Manufacturers, Or Equal:

1. ASAHI/America.

2. Chemline Plastics Limited.

3. Spears Mfg, Model SK-2-0609.

4. Thermoplastic Valves Inc.

2.8 FLAP VALVES

A. Flap valves shall have an iron body with bronze seat and disc rings. Pins shall be made of bronze or Type 316 stainless steel.

B. Manufacturers and Models, Or Equal:

1. Kennedy Valve Mfg. Co., Model F-3012.

2. Troy Valve, Model A-2540-6.

3. Waterman Industries, Model PF-25.

PART 3 - EXECUTION

3.1 GENERAL

A. Field testing of valves shall be performed in accordance with manufacturer's recommendations and per Section 15100, Valves, General, of these Specifications.

B. All field testing shall be witnessed by the ENGINEER and be subject to ENGINEER’s acceptance.