Section 15103 BUTTERFLY VALVES

Section 15103

BUTTERFLY VALVES

PART 1 – GENERAL

1.1 THE REQUIREMENT

A. The Work of this Section includes providing butterfly valves with epoxy coating, operators, and accessories for air and water service.

1.2 REFERENCE SPECIFICATIONS, CODES AND STANDARDS

A. Comply with the reference specifications of Section 01090.

B. Comply with the current provisions of the following Codes and Standards.

1. Commercial Standards

ASTM A126 Gray Iron Castings for Valves, Flanges, and Pipe Fittings

ASTM A536 Ductile Iron Castings

AWWA C504 Rubber-Sealed Butterfly Valves

1.3 QUALITY ASSURANCE

A. Valves shall be tested in compliance with AWWA C504 and Section 15100.

PART 2 – PRODUCTS

2.1 BUTTERFLY VALVES (AWWA)

A. General: Butterfly valves shall conform to AWWA C504 and shall be flanged in accordance with Section 15100. Butterfly valves shall be designed for a minimum working pressure of 150 psi. Shaft seals shall be designed for use with standard split-V type packing or other approved seals, and the interior passage shall not have any excessive obstructions or stops. Cartridge-type valve seats or valve employing snap rings to retain the rubber seats will not be acceptable. The rubber seat shall be mounted in the valve body.

B. Coating: Corrosive ferrous surfaces of valves which will be in contact with water

(exclusive of flange faces) shall be epoxy coated complying with Section 09800.

C. Manual Operators: Operators shall conform to AWWA C504, Section 15101 and as specified herein. Except as otherwise indicated, manually operated butterfly valves shall be equipped with a handwheel and 2-inch square operating nut and position indicator.

2.2 BUTTERFLY VALVES FOR AIR OR GAS SERVICE

A. General: Butterfly valves for air systems shall be designed for this service and meet or exceed the design, strength, performance, and testing standards of AWWA C504. Butterfly valves shall be designed for pressures from vacuum to 125 psi and temperatures from minus 40 degrees F to 250 degrees F.

B. Body: Valve bodies shall be fabricated with cast iron conforming to ASTM A126, Class B

with wafer, lug, or flanged design, where indicated, drilled to ANSI B16.1, Class 125.

C. Disc: The disc shall be fabricated with ductile iron conforming to ASTM A536 with an edge of monel, Type 316 stainless steel or nickel; it shall be designed with the air-profile or other proper shape. Sprayed or plated disc edges are not acceptable.

D. Seat: The elastomer seat shall be mounted in the valve body. The seat shall be field- replaceable without special tools. The seat material shall be EPDM or other suitable material to provide a tight shutoff at the indicated temperatures. The elastomer thickness shall be minimum ½-inch exclusive of backing rings or stiffeners.

E. Shaft: The valve shaft shall be fabricated with stainless steel, Type 316.

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

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

H. Operators: Valve operators shall be in accordance with Section 15101 and shall be sized for service applications and designed for three years of service. Manual actuators shall allow for positive throttling and locking in any position from open to closed.

2.3 MANUFACTURERS

A. Butterfly valves shall be manufactured by one of the following or equal:

1. DeZurik

2. Centerline

PART 3 – EXECUTION

3.1 INSTALLATION

A. Installation shall be in accordance with the manufacturer’s instructions and Section

15100.

B. Exposed butterfly valves shall be installed to permit removal of valve assembly without dismantling the valve or operator.

C. 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 shown on the drawings.

END OF SECTION