Section 15104 BUTTERFLY VALVES

Section 15104

BUTTERFLY VALVES

PART 1 - GENERAL

1.1 THE REQUIREMENT

A. The CONTRACTOR shall furnish and install butterfly valves, complete and operable, as shown and specified herein, including epoxy coating, appurtenances, operators, and accessories, in accordance with the requirements of the Contract Documents.

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 15101, Valve Operators

3. 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 B16.1 Gray Iron Pipe Flanges and Flanged Fittings

ASTM A 126 Standard Specification for Gray Iron Castings for

Valves, Flanges, and Pipe Fittings

ASTM A 536 Standard Specification for Ductile Iron Castings

AWWA C504 Rubber-Seated Butterfly Valves, 3 Inches (75

Millimeters) through 72 Inches (1,800

Millimeters)

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.

1.5 QUALITY ASSURANCE A. General:

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

2. Records of tests shall be furnished as specified in AWWA C504. An affidavit of compliance as specified in Section 1.7 of AWWA C504 shall be furnished. Certified drawings and material specifications shall be submitted by the CONTRACTOR covering the items included in Section 1.4 of AWWA C504.

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 BUTTERFLY VALVES (AWWA)

A. General: Butterfly valves shall conform to AWWA C504, Class 150B, conform to NSF Standard 61 and subject to the following requirements. Valves shall be short bodied and of the size and class shown or Class 150B, if not otherwise indicated. Wafer valves may be used where accepted by the ENGINEER. Shaft seals shall be designed for use with standard split-V type packing, or other acceptable seal. The interior passage of butterfly valves shall not deviate from the nominal diameter by more than 1 inch nor shall it have any obstructions or stops.

B. Design: Valves and actuators shall be designed for a flow through the valve corresponding to a pipeline velocity of 16 feet per second with the vane in the position of maximum coefficient of torque or for the maximum torque that may occur under the specified operating conditions of flow, pressure, valve angle, including seating, unseating, and bearing torque. Safety factors for cylinder torques shall be as recommended in the Appendix of AWWA C504. Valves shall be suitable for installation in any position and for flow in either direction. Valve disc shall seat in a position of 90 degrees to the pipe axis and shall rotate 90 degrees between full open and closed position.

C. Materials:

1. Valve discs for valves on liquid service shall be stainless steel or shall have stainless steel mating edge on Ni-resist cast iron. Method of attaching edge to disc shall be subject to acceptance by the ENGINEER.

2. The valve shaft, keys, dowel pins, and taper pins used for attaching the valve shaft to the valve disc shall be Type 316 stainless steel or equivalent corrosion resistant material. All portions of the shaft bearings shall be 316 stainless steel, bronze, nylon, or fiberglass and Teflon in accordance with AWWA C504.

3. Nuts and screws used to retain rubber seats shall be prevented from loosening due to vibration or cavitation.

4. Butterfly valves shall be short body type. Bodies shall be of cast iron or steel construction. Wafer-type valves shall have stainless steel bodies.

D. Coating: All corrodible ferrous surfaces of valves, 4 inches and larger, that will be in contact with water, exclusive of flange faces, and the exterior surfaces of buried valves shall be amine-cured epoxy-coated with System No. 100 as specified in Section 09800, Protective Coating.

E. Manual Operators: Operators shall conform to AWWA C504, subject to the following requirements.

1. Manual actuators for valves with less than a 6-inch diameter shall be the hand- lever type. Hand-lever actuators shall be provided with a locking device so that the valve can be locked in any position with a wing nut. The locking device shall be rigid and shall not allow any vibration or chattering of the valve. The hand lever shall be

12 inches long and shall be provided with a rubber hand grip.

2. Underground valves 6 inches and larger shall be provided with a totally enclosed worm gear or traveling nut actuator mounted on the valve. The valve shaft shall extend from the valve to the actuator and shall be as specified for valve shafts. The actuator shall be gasketed for watertightness. Actuators shall be suitable for buried service and shall have an actuator shaft extension to finish grade, a 2-inch-square AWWA nut, valve box, and cover.

3. Manual actuators on aboveground butterfly valves larger than 6 inches shall be worm geared or traveling nut actuators except that valves 8 inches and smaller on low pressure air service may be lever operated.

4. Butterfly valves aboveground not specified to have geared actuators shall be fitted with ell or tee wrenches, or handles for operation.

F. Manufacturers, Or Equal:

1. DeZurik Corporation, Model BAW.

2. Henry Pratt Company.

2.2 RECTANGULAR BUTTERFLY VALVES

A. General: Rectangular or square butterfly valves shall be leak tight at rated pressures with flow in either direction. Valves shall be satisfactory for applications involving throttling service and/or frequent operation and for applications involving valve operation after long periods of inactivity. Valve discs shall rotate 90 degrees from the full-open position to the tight-shut position.

B. Body: The valve body shall be of Type 316 stainless steel designed for channel mounting, or as shown, with a pressure rating of 25 pounds per inch.

C. Disc: The valve disc shall be fabricated of Type 316 stainless steel. Leakage at corners under specified conditions or tests shall be cause for rejection. The disc shall be streamlined in shape to prevent turbulence in the full-open position and to minimize head loss across the valve.

D. Seat: The valve seat shall be contained in the body of the valve. The retaining segment and screws shall be of Type 316 stainless steel. The seat shall be of a synthetic rubber compound with a durometer of 50 and chemically compatible with the liquid in service. Seats shall be fully field adjustable and replaceable without dismantling operator, disc, or shaft.

E. Shaft: The shaft shall be securely locked to the disc by means of stainless steel taper pins. Shaft material shall be of Type 316 stainless steel.

F. Bearings: Each valve assembly shall be furnished with a two-way thrust-bearing assembly designed to hold the disc centered in the valve seat at all times, and with self- lubricated shaft bearings.

G. Operator: Operators shall be as indicated on Drawings and as specified in Section

15101, Valve Operators, and designed to hold the valve in any intermediate position between fully open and fully closed without creeping or fluttering. Unless otherwise shown, operators shall be of the manual worm-gear type with handwheels. Operators shall be fully enclosed and shall be designed to produce the specified torque with a maximum pull of 40 lb on the handwheel. Operator components shall withstand an input torque of 300 foot-pounds at extreme operator positions without damage.

H. Manufacturers, Or Equal:

1. DeZurik Corporation.

2. Henry Pratt Company.

2.3 BUTTERFLY VALVES FOR AIR AND GAS SERVICE

A. General: Butterfly valves for air and gas systems shall be specifically designed for this service and meet or exceed the design, strength, performance, and testing standards of AWWA C 504. They shall be suitable for pressures from vacuum to 125 pounds per inch, and temperatures from minus 40 degrees F to 250 degrees F.

B. Body: The valve body shall be of cast iron conforming to ASTM A 126, class B, with either wafer, lug, or flanged design, as shown, drilled to ASME B 16.1, class 125.

C. Disc: The disc shall be of ductile iron to conforming ASTM A 536 with an edge of monel, Type 316 stainless steel, or nickel; it shall be designed with the air profile or other suitable shape. Sprayed or plated disc edges are not acceptable.

D. Seat: The elastomer seat shall be in the body. It shall be field replaceable without special tools. Except for use with petroleum-base fluids, the seat material shall be Ethylene-Propylene-Diene Monomer (EPDM), or other suitable material, to provide a tight shutoff at the above-mentioned temperatures. The elastomer thickness shall be minimum 1/2 inch, exclusive of backing rings, or stiffeners.

E. Shaft: The valve shaft shall be of 316 stainless steel, with sufficient strength to allow for the increased torque for air service.

F. Bearings: All shaft bearings shall be of the self lubricating corrosion resistant sleeve type.

G. Packing: The packing shall be of the adjustable or self adjustable type, suitable for the temperature and service conditions.

H. Actuators: All valve actuators shall be in accordance with Section 15101, Valve

Operators. They shall be sized for air service applications with the torque condition after

3 years of service. Manual actuators shall allow for positive throttling and locking in any position from open to close.

I. Testing: All valves shall be factory leak tested in accordance with AWWA C 504.

J. Manufacturers, Or Equal:

1. DeZurik Corporation.

2. Henry Pratt Company.

PART 3 - EXECUTION

3.1 INSTALLATION

A. All exposed butterfly valves shall be installed with a means of removing the complete valve assembly without dismantling the valve or operator. The installation shall be in accordance with Section 15100, Valves, General.

B. Wafer butterfly valves shall not be used as an isolation valve where equipment or piping may be removed from one side of the valve. Wafer valves may be used only between pipe flanges and in locations where the opening of the valve disc will not interfere with adjacent piping, fittings, check valves, and other equipment. Spacers or spools shall be provided in locations where the disc travel or integrity may be impaired by adjacent pipe lining, pipe fittings, valves, or equipment.

C. Short-body valves may be used only in locations where the disc will not interfere with adjacent pipe fittings, valves, or equipment.

D. Valves shall be installed with valve shafts horizontal, unless a vertical shaft is required to suit a particular installation, and unless a vertical shaft is indicated on the Plans.

E. Field testing of valves shall be performed in accordance with manufacturers.

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