P-30ff Pressure Slide Gates

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The pressure slide gates shall be Waterman Model P-30ff or approved equal.

General

The gates shall be self-contained with yoke, benchstand operators, and non-rising stems (rising stem optional). Specific gate design and configuration shall be noted in gate schedule or as shown on plans.

Frame and Cover (Slide)

The frame and cover (slide) shall be cast iron with machined (bronze optional) seating faces. The frame shall be flatback or flangeback with 125 lb. drilling (25 lb. optional), while the cover shall be of domed design to withstand maximum seating head of 60 feet, or unseating head of 10 feet. A cast iron (on 14" and smaller, stainless steel on 16" and larger) guide rail shall be mounted to the frame to form a guide slot for flat vertical sides of cover and arch. The guide rail and headpiece, whether it be separate or integrally cast with frame, shall be designed to withstand the total thrust of the gate slide due to water pressure and wedging action. A heavy duty cast iron arch, pivoting about a center positioned cast iron wedge located on the cover, shall be provided to uniformly distribute wedging action over the entire seating surface. Predetermined stops on the frame shall stop the arch at the lowermost portion of gate travel, while allowing the cover to continue and wedge against the arch, forcing the seating surfaces together.

Stem

The stem shall be bronze (optional stainless steel) of suitable length and ample strength for the intended service. Any potion of the stem subject to thrust force, shall be capable of withstanding twice the rated output of the operator at 40 pound pull, and shall be supported such that a L/r ratio for the unsupported part of the stem shall not exceed 200. When rising stem is used, the stem extension shall be supported with stem guide such that a rigid installation shall be provided. Stem guides shall be so spaced, that the L/r ratio of the stem does not exceed 200.

Operators

On a standard gate with non-rising stem, the screw head is mounted on top of the headrail, and includes a handwheel (2" square nut optional) located above the gate as shown on the plans. On a rising stem gate, manually operated lifting mechanisms shall be as indicated on the plan drawings or in the gate schedule. Handwheel type lifts shall have threaded bronze lift nuts to match the stem. Threads shall be machine cut, acme type, and left hand. An arrow shall be cast on the handwheel to indicate the direction of rotation to open the gate. A maximum effort of 40 pounds shall be required to operate the gate after it is unseated, based on the maximum specified operating head.

Material

Frame, Cover (slide), Handwheel, Yoke and Rails (14" and smaller), Screwhead. Cast Iron - ASTM A-126, Class B Rails (16" and larger) Stainless Steel - A-276, Type 304 Stem and Lift Nut - Free Cutting Brass - Alloy 360 Assembly Hardware and Fasteners - Stainless Steel ASTM F-593 and 594 Paint - Manufacturer's Standard

Other Optional Items Include

Galvanized Steel Rails - ASTM A-36 Galvanized per A-123 Stainless Steel (Type 304) Stems Galvanized Assembly Hardware Special Paint Finish: Coal Tar Epoxy, Polyamide Epoxy, etc.