Section 15110 PLUG VALVES

Section 15110

PLUG VALVES

PART 1 – GENERAL

1.1 THE REQUIREMENT

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

1.2 REFERENCE SPECIFICATIONS, CODES AND STANDARDS

A. Comply with the reference specifications of Sections 01090, 09800, 15100, AND 15101. B. Comply with the current provisions of the following Codes and Standards.

1. Commercial Standards

ASTM B62 Composition Bronze or Ounce Metal Castings

1.3 QUALITY ASSURANCE

A. All valves shall be tested in accordance with manufacturer’s standard procedure and applicable AWWA/ANSI standards.

PART 2 – PRODUCTS

2.1 ECCENTRIC PLUG VALVES

A. Eccentric plug valves shall be of the non-lubricated eccentric type with cast iron bodies, with isobutene-isoprene plug face capable of withstanding 250 degrees F. The valve body shall be ASTM 126, Class B cast-iron, with flanged or grooved ends. The body seats in valves 4-inch and larger shall be Type on surfaces contacting the plug face. Plug shall be ductile iron.

B. Except as otherwise indicated, all valves for sizes 4-inch and larger shall have worm gear operators with all gearing enclosed and seals on all shafts to prevent entry of dirt or water. Valves 2 ½-inches and smaller shall have operating levers, nickel or stainless steel seats, and threaded ends with resilient facing suitable for the intended service. Submerged or buried valves shall be equipped with worm-gear operators, lubricated and sealed to prevent entry of dirt and water into the operator.

C. Shaft bearings shall be stainless steel furnished with permanently lubricated bearing surfaces. Operators shall clearly indicate valve position.

D. Valves up to and including 20-inches in size shall have an unobstructed port area of not less than 80 percent of full pipe area, and not less than 70 percent for larger valves. Eccentric plug valves shall have a pressure rating of not less than 150 psi water, oil or gas (WOG) service and bubble-tight shutoff.

E. Coating: Ferrous surfaces of valves which will be in contact with process fluid shall be epoxy coated as specified in AWWA C550, Protective Epoxy Interior Coatings for Valves and Hydrants.

2.2 MANUFACTURERS

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

1. DeZurik

2. Clow

PART 3 – EXECUTION

3.1 INSTALLATION

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

15100.

B. Except as otherwise indicated, the installation of eccentric plug valves in sewage, sludge, or other liquid systems containing solids, silt, or fine sand shall comply with the following:

1. Valves shall be installed with the stem in the horizontal position.

2. In horizontal piping, the plug shall swing upwards when opening to permit flushing out of solids.

3. The flow direction through the installed valve shall be such that the valve body cannot fill up with incoming solids when the valve is closed.

4. Valves where closure for extended periods is indicated (stand-by, bypass, or drain lines), and valves where reversed flow is indicated (higher pressure on downstream side forcing the plug away from its seat) shall include worm gear operators for sizes 4 inches and larger.

END OF SECTION