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923-D – Standard Weir 920 Slide Gate

Whipps, Inc.’s Model 923-D Weir Slide Gate is designed for applications requiring precise water elevation control in areas with limited headroom. Featuring a downward-opening configuration, this stainless steel slide gate provides accurate flow management while maintaining the strength, corrosion resistance, and long-term reliability of our 900 Series gates.

Series	900 Series
Type	Gates & Flow Control
Category	Slide Gate
Mounting Configurations	Channel-Mounted, Embedded Mounting, Wall-Mounted
Materials	Stainless Steel
Size Ranges	12" x 12" typically up to 96" x 96" – but we can typically accommodate any custom needs.
Industries	Environmental Restoration Projects, Navigation Locks and Canals, Flood Control Systems, Hydroelectric Power Plants, Industrial Water Systems, Mining Industry, Irrigation Systems, Municipal Stormwater Systems, Water and Wastewater Treatment Plants
Shape	Square, Rectangle

General Information

The Model 923-D from Whipps, Inc. is a stainless steel slide gate engineered with a downward-opening configuration, making it an ideal choice for installations with limited headroom or where precise water elevation control is required. Part of our stainless steel 900 Series, the 923 is categorized as a sluice gate but designed without a top seal, allowing water to overflow if levels rise above the top of the slide. This feature makes it well-suited for installations where controlled overflow is an operational requirement.

Also known as a weir gate, the 923-D allows operators to manage water levels accurately by lowering the slide rather than raising it, offering flexibility in applications such as wastewater treatment facilities, flood control systems, and flow regulation channels. Like the standard 923, the 923-D is constructed from corrosion-resistant stainless steel and mounted using anchor bolts for secure alignment and dependable sealing performance. This bolted configuration ensures stability, precise alignment, and dependable sealing performance, even under challenging operating conditions.

Gate selection is determined using a simple Width × Head formula: totals of 80 or less call for our Model 920 standard-duty gate; totals over 80 and up to 120 require the Model 930 medium-duty design; and higher loads or larger openings exceeding 120 may require the heavy-duty Model 950 configuration. This sizing approach ensures that every gate is engineered to handle its specific operating pressures and flow conditions.

Each gate is custom-fabricated to meet site-specific requirements, with precision components that ensure smooth, consistent operation and minimal maintenance. With UHMW seals, robust construction, and Whipps, Inc.’s proven engineering, the 923-D is designed to deliver decades of reliable performance in demanding water control environments.

Product Advantages

Superior Performance

Whipps, Inc. guarantees lower leakage than that listed in AW WA C-SOI- Cast Iron Sluice Gates or the latest revision, AWWA C-560 – Cast Iron Slide Gates. Whipps, Inc. will guarantee leakage of no more than 0.05 gpm/ft of seal perimeter in seating head and unseating head conditions. Including high head service.

Cost

Fabricated stainless steel gates almost always cost less than cast iron gates. As the size of the gate increases, the price difference increases. This is due to the manufacturing process (e.g. casting of parts and subsequent machining) required to produce cast iron gates.

Strength

The ultimate strength of stainless steel is in excess of twice the ultimate strength of cast iron and stainless steel has approximately twice the modulus of elasticity of cast iron.

Durability

Stainless steel resists corrosion better than cast iron. The uv stabilized UHMW seat/seals that are utilized on our stainless steel gates are field proven to maintain shape and integrity in demanding applications. Whipps, Inc. tested the UHMW seatjseals to confirm the ability to withstand continuous operation in an abrasive environment. The testing consisted of 25,000 gate open/close cycles in an abrasive media while experiencing only negligible wear. (Test results available upon request)

Reliability

Unlike traditional cast iron gates, the slide will not “freeze” to the frame after long periods of inactivity. Whipps, Inc. stainless steel gates incorporate UHMW seat/seals to prevent any metal-to-metal contact between the slide and the frame.

Delivery

The fabrication process required to turn raw materials into a stainless steel gate is quicker than the casting and machining process required to turn raw materials into a cast iron gate

Self-Adjusting Seals

The Series 900 stainless steel gates have a self-adjusting seal system that completely eliminates the need for field adjustment. This seal system was developed with the understanding that many gates are installed in locations where field adjustment of wedges is not practical or possible. Another drawback to a wedged system is that wedge adjustment is an inexact science. Wedge adjustment when attempted by inexperienced personnel can lead to additional leakage, difficult gate operation and increased localized gate stresses. The self-adjusting seal system is a combination of durable UHMW seatjseals and a resilient static spring/seal. The UHMW seat/seals are shaped to form a low friction, yet tight, seal with the slide. The spring/seal serves two main purposes: First; it acts as a bulb seal etween the frame and the UHMW seat/seal and secondly; it acts as a “spring” to ensure continuous contact between the UHMW seat; seals and the slide. The spring/seal is stationary, similar to an O-ring seal. and it is protected from wear or damage from the movable slide by the UHMW seatjseals. (Wedges can be provided on our Series 900, but they are not recommended since they do not improve the performance of our gate.)

Low Maintenance

Stainless steel gates do not require periodic painting, and require less operator attention compared to cast iron gates.

Ease of Repair

In the unusual event that the seat/seals are damaged, they can be replaced in the field with common tools. The gate does not have to be removed from the wall. If the seating surface on a cast iron gate is damaged, the gate will have to be removed from the wall and shipped back to the manufacturer for re-manufacture.

Range of Sizes

The process to design and manufacture fabricated gates allows for a nearly unlimited range of sizes. This is not the case with cast iron gates since new patterns or modifications to existing patterns are required to accommodate unusual sizes.

Mounting Configurations

Gate frames may be embedded in the channel walls. mounted to a wall with anchor bolts, mounted to a pipe flange, or wall thimble. Wall thimble mounting is possible although it is usually only necessary for applications with high unseating heads. Gates can also be designed to mount to existing wall thimbles or existing pipe flanges. Flanged frames or flat frames are available for gates to cover square, rectangular or round openings in concrete structures.

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900 Series

Stainless Steel Gates

Telescoping & Butterfly Valves

Recent Stainless Steel Gate Water Control Equipment News & Updates

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923-D – Standard Weir 920 Slide Gate

General Information

Product Advantages

Superior Performance

Cost

Strength

Durability

Reliability

Delivery

Self-Adjusting Seals

Low Maintenance

Ease of Repair

Range of Sizes

Mounting Configurations

Recent Stainless Steel Gate Water Control Equipment News & Updates