Rectangular Butterfly Gates Spec Sheet:

You can copy and paste this information into your word processor.

General
Butterfly gates shall be square or rectangular and shall be as manufactured by Hydro Gate or equal. They shall be of the size shown in the “Gate Schedule” and/or in the contract drawings. Each gate shall be complete with frame, leaf, actuator and all necessary attaching bolts. Each gate shall be self-contained and, when installed in accordance with the manufacturer’s recommendations, shall be watertight up to a differential head of 20 ft on the horizontal centerline of the gate.

Gate Leaf
The gate leaf shall be fabricated from ASTM A36 carbon steel. It shall be designed for the maximum head shown in the “Gate Schedule.” Design stresses for all structural parts shall have a safety factor of 3.0 on the yield strength or 5.0 on ultimate strength – whichever is less. A stainless steel seating face shall be furnished around the periphery of the leaf. The four corners of the leaf shall be rounded with a radius not to exceed 7.25 in. to seal with similar rounded corners in the gate frame.

Gate Frame
The gate frame shall be fabricated from ASTM A36 carbon steel to the size shown in the “Gate Schedule” and shall be arranged to bolt to the front face of a concrete wall, either attached to a thimble or installed within steel liners as shown in the contract drawings or in the “Gate Schedules.”

A resilient, neoprene seal shall be attached firmly to the gate frame to provide a watertight contact with the stainless steel seating face on the gate leaf when the gate is in the fully closed position. All stainless steel parts shall be per ASTM A582, Type 303; or ASTM A276, Type 304 or 304L.

The stainless steel backup angle for the seal shall be positioned accurately and welded to the gate frame. Stainless steel studs shall be welded to the back-up angle on a center-to-center spacing as required to hold the seal in place and provide field adjustment when required. Adjusting segments shall be furnished to contain the downstream side of the resilient seal and push uniformly against the seal for adjustment and to hold it in place. Adjusting fasteners and segments shall be Type 303 or Type 304 stainless steel. The neoprene seal shall be adjustable from the downstream side of the leaf after the gate is installed.

Shaft bearing housings shall be bored and supplied with vertical shaft bearings of the self-lubricating type. The maximum unit pressure on the bearing shall not exceed 2,500 psi when the gate is subjected to the design head shown in the “Gate Schedule.”

Adjustable Thrust Bearing
A stainless steel thrust collar shall be located at the top of the gate opening and shall be designed to take the load that is developed during gate operation.

The thrust collar shall be supported in its own housing and will have a self-lubricating thrust bearing below its surface. It shall be adjustable after the gate is installed and shall provide for centering of the leaf within the gate frame.

Gate Shafting
The gate shaft shall be Type 304 stainless steel and be of a diameter necessary to operate the gate under the maximum specified head. The shaft shall be of the stub type and shall extend into the gate leaf for a minimum 1-1/2 diameters. It shall be removable from the top of the gate frame without dismounting the gate from the wall. O-ring gaskets shall be installed around the shafting at the top and bottom of the gate opening to prevent water from leaking past the shaft in either direction.

Gate Actuator
The actuator shall be mounted above the gate opening. It shall be supported on a fabricated steel bonnet and shall be capable of opening and closing the gate leaf through an arc of 90º and holding the leaf in any intermediate position. It shall be manual type with handwheel operation, hydraulically actuated, or with an electric actuator to supply power to the manual unit in place of the handwheel. The latter type shall move the gate from the fully opened to the fully closed position, or vice versa, within one minute or less.

Materials
Materials shall conform to the requirements of the following ASTM standards.

Cast Iron
ASTM A126, Class B or C

Carbon Steel (Leaf, Frame, Fabricated Slot)
ASTM A36

Stainless Steel (Shaft, Seating Face)
ASTM A582, Type 303; or ASTM A276, Type 304 or 304L

Stainless Steel (Anchors, Studs)
ASTM A276, Type 304

Resilient Seal
ASTM D2000, Grade 1AA625

Stainless Steel (Fasteners)
ASTM F593, Alloy Group 1 for bolts
ASTM F594, Alloy Group 1 for nuts