A. Type. All main line gate valves larger than four inches shall conform to AWWA Standards C500-61 when standard operating conditions are encountered. Where other than standard operating conditions are encountered, such as excessive water-hammer, operating in throttled position or high operating pressures, gate valves of design approved by the county engineer shall be used. Gate valves four inches and smaller shall be rated two hundred psi working pressure for nonshock, cold water service. All working parts of this class valve shall be bronze or bronze mounted and shall be standardized and interchangeable. Gate valve ends shall be of any of the types commonly used in the waterworks industry, including screwed ends, hub ends, mechanical joint ends, flanged ends, spigot ends, universal ends, and any ends other than those commonly used in the industry must have the approval of the county engineer.
B. Location. In general, on distribution systems, a minimum of three valves shall be placed at a cross and two valves at a tee and shall be placed on the projection of property lines.
C. Size. Gate valves shall be of the same size as the pipeline in which they are installed.
D. Spacing. Valves on distribution systems shall be so located that any single break, accident or repair, will not necessitate shutting from service a length of main greater than 1,320 feet except that in mercantile, industrial, or other higher value districts the county engineer may require a maximum length of six hundred and sixty feet. (Ord. 383 § 240, 1974).

A. Type. All air release and vacuum valves shall have the internal working parts made of corrosion resistant materials. Air release and vacuum valves shall have a minimum pressure rating of one hundred and fifty psi, nonshock, cold water, oil and gas rating. Design must ensure release of air from the system and closure must be positive.
B. Location. All air release and vacuum valves of adequate size shall be installed where necessary at all high points on mains.
C. Installation. Suitable housing and protection for said valves shall be provided and a shut-off valve shall be provided in conjunction with each air release and vacuum valve to permit removal of said valves for maintenance and servicing. Sand blow-offs as required shall be installed. (Ord. 383 § 241, 1974).

Check valves for regular duty waterworks service shall employ noncorrosive materials in the construction of hinge pins, hinges, gate faces and seat faces.

Check valves up to twelve inches in size for regular duty shall have a pressure rating of not less than two hundred psi nonshock, cold water, oil or gas rating. Larger valves and valves for use in other than regular duty shall be of a pressure rating approved by the county engineer.

End connections on check valves may be any ends commonly used in waterworks practice, including hub ends, flange ends and universal ends. Types of ends other than those commonly used in the waterworks industry shall have the approval of the county engineer. (Ord. 383 § 242, 1974).

A valve box, vault, or standpipe shall be provided for every valve installed below the street pavement subject to the approval of the county engineer and the road commissioner as to type and grade. All valve box covers shall be marked with the word “WATER” or a “W.” Valve and meter boxes shall be constructed of materials capable of withstanding the loads imposed upon them.

Adequate access to all boxes shall be provided by means of readily removable covers.

Sizes of boxes shall be determined by sizes of valve or meter served. (Ord. 383 § 243, 1974).

The term “plug valve” shall, in these standards, refer to regular duty plug valves, corporation stops and curb stops.
A. Regular duty plug valves shall be designed for regular duty service and in sizes below twelve inches, shall have a pressure rating not less than 175 psi water, oil or gas working pressure. Valves larger than twelve inches shall have a pressure rating adequate for the service intended and said pressure rating shall have the approval of the county engineer.
B. Curb stops shall have all bronze bodies, keys, tail-pieces, base caps, combined cap and tees, stem washers and stem nuts. Curb stops shall have the proper coupling threads for the type of fittings to which attached.
C. Corporation stops shall have all bronze bodies, keys, stems, stem washers and stem nuts. Corporation stops shall have the proper type threads for the type of pipe or pipe clamp to which attached. (Ord. 383 § 244, 1974).

All dead-ended mains and noncirculating mains shall be equipped with a two inch gate valve and blow-off at the terminus thereof. (Ord. 383 § 245, 1974).

Any type of valve not specifically covered in these specifications shall be considered in the category of miscellaneous types of valves.

Such valve types include: Pressure relief valves, pressure regulating valves, altitude valves and globe valves, among other valve types.

Valves in this classification shall have the approval of the county engineer. (Ord. 383 § 246, 1974).