Weir Gates Spec Sheet: 

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Specifications For Stainless Steel and Carbon Steel Slide Gates
Specifications for Aluminum Slide Gates


Specifications For Stainless Steel and Carbon Steel Slide Gates

General
Slide and weir gates, including lifts, stems and accessories, shall be of the size and type shown on the manufacturer’s drawings and specified herein. Where possible, gates shall be installed so that there is a seating head on the gate. Gate type, lift type, frame type, size, seating head, and bottom-closure type are indicated in the “Gate Schedule.” Gate, frame and yoke design shall be such that the flexural stress does not exceed 15,000 psi for stainless steel, 11,600 psi for carbon steel, or that the minimum safety factor is 4 based on the ultimate strength of the material used.

Manufacturers
Hydro Gate or approved equal.

Materials of Construction
Frame, Slide and Reinforcing
Stainless steel, ASTM A276, Type 304
Carbon steel, ASTM A36

Stems
Stainless steel ASTM A276, Type 304

Fasteners
Stainless steel, ASTM F593/F594, Alloy Group 1

Anchors
Stainless steel, ASTM F593/F594, Alloy Group 1

Rubber Seals
Neoprene, ASTM D2000, Grade 1BE625

Guides
Ultra High Molecular Weight (UHMW) Polymer, ASTM D4020

Gate Construction

Frame
Gate frame shall be flat back or channel mount as shown in the “Gate Schedule.” Spigot-back frames are not acceptable. The frame shall be an integral unit of structural shapes, rigidly assembled to form the waterway opening. The frame members shall form guides for the slide, and holes shall be provided for mounting of anchor bolts. The head channels shall be welded to the gate frame. The channels are to be sufficiently spaced to allow removal of the gate slide. The primary slot of the frame shall contain polymer guide bars to prevent metal-to-metal contact between slide and frame.

Slide
Gate slide shall conform to the safety factors stated under “General” but shall, in no case, be less than ¼ in. thickness. Deflection under full head shall be limited to 1/360 of the span. The stem connector clips or stem block pocket shall be welded to the slide.

Flush-Bottom Seals
Slide gates shall incorporate a flush-bottom seal that is attached to the bottom frame invert member. The seal shall be of the materials shown in “Materials of Construction.” Seals attached to the slide are not acceptable.

Seals
J-seals shall be provided as specified in the “Gate Schedule.” Seals shall be securely fastened to the frame with formed stainless steel retainers and shall be replaceable and adjustable without removing the gate from the installed position. The corners of the J-seals shall be vulcanized.

Stems
Gate stem diameter shall be adequate to withstand twice the force created by a 40-lb pull on the handwheel or crank. Stems shall have rolled threads with a maximum roughness of 16 micro-inches. Cut threads are not acceptable. The stem shall be supported by angle guides or cast iron with a 2-piece cast bronze guide collar, spaced to provide an 1/r ratio of 200 or less. Stems shall withstand 1.25 times the stalled motor thrust of the actuator.

Manual Lifts
Gate lifts shall be handwheel or geared crank type as shown in the “Gate Schedule.” Lifts shall operate the gate with a maximum pull of 40 lb on the handwheel or crank. Handwheel or crank shall be located approximately 36 in. above grating or walkway. All lifts shall have thrust bearings, bronze lift nuts and a bronze stop nut to limit the downward travel of the stem and slide. All geared lifts shall have cast iron housings and pedestals. Aluminum housings and pedestals shall not be acceptable. All lifts shall be rising stem type. Stem covers made of clear butyrate shall be furnished for all lifts. Lifts shall be grease lubricated and regreasable through grease zerks. Oil bath lifts are not acceptable.

Motor-Operated Lift
Motor operator shall be a 460-V, 3-phase, 60-Hz motor with precision reduction gearing enclosed in weatherproof housing. The operator shall be designed to raise the gate at a rate of approximately 12 in./min. Integral controls shall include a control power transformer, reversing controller, torque switches, limit switches, space heater to prevent condensation, open-stop-closed push-buttons and gate position indicator. Where applicable, the controls shall also include a local-off-remote selector switch. Motor reduction helical gear and pinion shall be of heat-treated alloy steel. Final reduction worm shall be of alloy steel and worm gear of machined high-tensile strength bronze. All gearing shall be proportioned for 100% overload condition. Operator shall have a declutch lever and handwheel for manual operation.



Specifications for Aluminum Slide Gates

General
Slide and weir gates including lifts, stems and accessories, shall be of the size and type shown on the drawings and specified herein. Where possible, gates shall be installed so that there is a seating head on the gate. Gate type, lift type, frame type, size, seating head, and bottom closure type are indicated in the “Gate Schedule.” Gate, frame, and yoke design shall be such that the flexural stress does not exceed 7,600 psi or that the minimum safety factor is 5-to-1 based on the ultimate strength of the material used.

Manufacturers
Hydro Gate or approved equal.

Materials of Construction
Frame, Slide, and Reinforcing
Aluminum, ASTM B209, Alloy 6061, or ASTM B308, Alloy 6061

Stems
Stainless steel, ASTM A276, Type 304

Fasteners
Stainless steel, ASTM F593/F594, Alloy Group 1

Anchors
Stainless steel, ASTM F593/F594, Alloy Group 1

Rubber Seals
Neoprene, ASTM D2000, Grade 1BE625

Guides
Ultra High Molecular Weight (UHMW) Polymer, ASTM D4040

Gate Constructioin

Frame
Gate frame shall be flat back or channel mount as shown in the “Gate Schedule.” Spigot-back frames are not acceptable. The frame shall be an integral unit of extrusions and structural shapes, rigidly assembled to form the waterway openings. Holes shall be provided for mounting on anchor bolts. The head channels shall be welded to the gate frame. The channels are to be sufficiently spaced to allow removal of the gate slide. The primary slot of the frame extrusion shall contain polymer guide liner retained in grooves, to prevent metal-to-metal contact between slide and frame.

Slide
Gate slide shall conform to the safety factors stated under “General”, but shall, in no case, be less than ¼-in. thickness. Deflection under full head shall be limited to 1/360 of the span. The stem connector clips or stem block pocket shall be welded to the slide.

Flush Bottom
Slide gates shall incorporate a flush-bottom seal that is attached to the bottom frame invert member. The seal shall be of the materials shown in “Materials of Construction.” Seals attached to the slide are not acceptable.

Seals
J-seals shall be provided as specified in the “Gate Schedule.” Seals shall be securely fastened to the frame with formed stainless steel retainers and shall be replaceable and adjustable without removing the gate from the installed position. The corners of the J-seals shall be vulcanized.

Stems
Gate stem diameter shall be adequate to withstand twice the force created by a 40-lb pull on the handwheel or crank. Stems shall have rolled threads with a maximum roughness of 16 micro-inches. Cut threads are not acceptable. The stem shall be supported by angle guides or cast iron with a 2-piece cast bronze guide collar, spaced to provide an l/r ratio of 200 or less. Stems shall withstand 1.25 times the stalled motor thrust of the actuator.

Manual Lifts
Gate lifts shall be handwheel or geared crank type as shown in the “Gate Schedule.” Lifts shall operate the gate with a maximum pull of 40 lb on the handwheel or crank. Handwheel or crank shall be located approximately 36 in. above grating or walkway. All lifts shall have thrust bearings, bronze lift nuts, and a bronze stop nut to limit the downward travel of the stem and slide. All geared lifts shall have cast iron housings and pedestals. Aluminum housings and pedestals are not acceptable. All lifts shall be rising stem type. Stem covers made of clear butyrate shall be furnished for all lifts. Lifts shall be grease lubricated and regreasable through grease zerks. Oil bath lifts are not acceptable.

Motor-Operated Lift
Motor operator shall be a 460-V, 3-phase, 60-Hz motor with precision reduction gearing enclosed in weatherproof housing. The operator shall be designed to raise the gate at a rate of approximately 12 in./min. Integral controls shall include a control power transformer, reversing controller, torque switches, limit switches, space heater to prevent condensation, open-stop-closed push-buttons, and gate position indicator. Where applicable, the controls shall also include a local-off remote selector switch. Motor reduction helical gear and pinion shall be of heat-treated alloy steel. Final reduction worm shall be of alloy steel and worm gear of machined, high-tensile strength bronze. All gearing shall be proportioned for 100% overload condition. Operator shall have a declutch lever and handwheel for manual operation.



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