Section 15109 GATE VALVES

Section 15109

GATE VALVES

PART 1 – GENERAL

1.1 THE REQUIREMENT

A. The work of this Section includes providing gate valves with epoxy coating, operators, and accessories.

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 B62 Standard Specification for Composition Bronze or Ounce

Metal Castings

AWWA C500 Gate Valves for Water and Sewerage Systems

1.3 QUALITY ASSURANCE

A. Valves shall be tested in compliance with AWWA C500 and Section 15100.

PART 2 – PRODUCTS

2.1 GENERAL

A. Buried valves shall be of the inside screw type and shall be designed for repacking under line pressure. Valves 14-inch and larger installed in vertical pipes with stems horizontal shall be fitted with bronze slides, tracks, rollers, and scrapers to assist the travel of the gate assembly. Quick-opening valves shall have quick opening levers and cams in lieu of handwheel operators. Where other operators are indicated, comply with Section

15101, Valve and Gate Operators.

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.

2.2 KNIFE GATE VALVES

A. Knife gate valves shall include raised faces and resilient seats for positive seating.

Wetted parts shall be constructed of Type 316 stainless steel. Gates shall be finish- ground on both sides and shall prevent packing or seat damage. Valves 2- to 4-inches in size shall include cast stainless steel bodies; valves 6- to 24-inches in size shall include cast semi-steel bodies with stainless steel hinges. Valve ends shall be flanged or wafer design, as indicated. Gate guides and jams shall be steel. Actuator shall be handwheel operated. Port design shall be full-flow.

2.3 RESILIENT-SEATED GATE VALVES (3-INCH AND LARGER)

A. Resilient-seated gate valves conforming to AWWA C509 shall have cast iron bodies with flanged, bell, or mechanical joint ends, rubber-coated cast iron disc, flanged bonnet, bronze stem, O-ring seals, and operators with handwheel, except as otherwise indicated.

2.4 GATE VALVES (SMALLER THAN 3-INCH)

A. Gate valves smaller than 3-inches shall be heavy duty type for industrial service, with threaded or soldered ends. The bodies shall have threaded tops or union bonnets, fabricated of bronze conforming to ASTM B62, with bronze stems, solid wedges, metal handwheels, and Teflon-impregnated packing. Buried valves shall have non-rising stems. Exposed valves (above ground) shall have rising stems. Valves shall have a minimum pressure rating of 125 psi steam or 200 psi coldwater except as otherwise indicated.

2.5 MANUFACTURERS

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

1. Knife Gate Valves: DeZURIK

2. Resilient-seated Gate Valves a. Clow

b. Mueller

3. Gate Valves (Smaller than 3-inch)

a. Crane

b. Milwaukee

PART 3 – EXECUTION

3.1 INSTALLATION

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

15100.

B. Gate valves shall be installed in the closed position.

END OF SECTION