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821 – Embedded 820 Slide Gate

The Model 821 Slide Gate from Whipps, Inc. is a lightweight, embedded aluminum slide gate designed for precise water control in demanding environments. Built with corrosion-resistant aluminum and UHMW seals, it combines strength, durability, and reduced weight for easier installation and long-term reliability. With its cost-effective design, the 821 ensures secure alignment, low leakage, and dependable performance across treatment plants, irrigation systems, and flood control applications.

UHMW SEAT/SEALS
LEAKAGE 1/2 OF AWWA C-561
EMBEDDED FRAMES
OPEN CHANNEL - NO TOP SEAL
YOKE MOUNTED ACTUATOR
RESILENT INVERT SEAL (FLUSH BOTTOM CLOSURE)

Basic Dimensions Introducing 821 Aluminum Slide Gate from Whipps, Inc.

Details and Dimensions of the 821 Aluminum Slide Gate from Whipps, Inc.

Series	800 Series
Type	Gates & Flow Control
Category	Slide Gate
Mounting Configurations	Embedded Mounting
Materials	Aluminum
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 821 Slide Gate from Whipps, Inc. is a lightweight, cost-effective solution for precise water control, offering the same proven reliability as our stainless-steel gates. Part of the aluminum 800 Series, the 821 is categorized as a slide gate since it does not include a top seal, allowing water to overflow if levels rise above the slide. Ideal for installations where controlled overflow is mandatory.

Unlike surface-mounted gates, the Model 821 is embedded directly into concrete, providing superior stability and secure alignment while minimizing leakage. Constructed from corrosion-resistant aluminum with UHMW seals, it combines durability and strength with the benefits of reduced weight, making handling and installation easier and more economical.

Each 821 is custom-fabricated to meet project requirements, with precision components that deliver smooth, consistent operation and long-term performance. From treatment facilities and irrigation systems to flood control structures, the Model 821 ensures dependable water management while reducing maintenance and installation challenges. Thanks to Whipps, Inc.’s dedication to quality, this embedded aluminum sluice gate is built to perfect fit our customers’ needs.

From wastewater treatment plants to flood control systems, the Model 821 provides reliable, low-maintenance performance with minimal downtime. Manufactured in our headquarters in Massachusetts, these aluminum slide gates are backed by Whipps, Inc.’s commitment to quality and are custom-designed to perform for decades with proper maintenance.

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.

Similar Items

921 – Standard Embedded 920 Slide Gate

The Model 921 Slide Gate from Whipps, Inc. is designed for applications where the frame is fully or partially embedded into concrete. Built from corrosion-resistant stainless steel, it provides long-lasting performance without the need for paint coatings. Its open-top design allows controlled overflow.

3D Drawing of 931 Stainless Steel Embedded Slide Gate

931 – Embedded 930 Slide Gate

The Model 931 Slide Gate from Whipps, Inc. is built for applications where the frame is fully or partially embedded into concrete. Constructed from durable stainless steel, it offers long-lasting, corrosion-resistant performance without paint coatings. Designed for medium-duty use, the Model 931 is ideal for installations where the Width × Head calculation exceeds 80 and is up to 120, providing added strength for higher head pressures.

3D Drawing of 951 Stainless Steel Embedded Slide Gate 2

951 – Heavy-Duty Embedded 950 Slide Gate

The Model 951 Slide Gate from Whipps, Inc. is engineered for installations where the frame is fully or partially embedded into concrete, ensuring maximum resistance to high head pressures. Made from corrosion-resistant stainless steel, it delivers reliable, long-term performance without the need for coatings. For applications where the Width × Head calculation exceeds 120, the heavy-duty Model 951 offers the extra strength and durability needed to handle larger openings and higher loads.

Product Categories & Tags

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All Products

900 Series

Stainless Steel Gates

Telescoping & Butterfly Valves

Recent Stainless Steel Gate Water Control Equipment News & Updates

Did you know that Whipps, INC. offers custom solutions for almost any industry in need of industry standard water control equipment products? If you have a specific need, any questions or are not sure where to look, We'd urge you reach out to us.

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Industries We Proudly Serve

Our Product Series

Mounting Configurations

821 – Embedded 820 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

Similar Items

921 – Standard Embedded 920 Slide Gate

931 – Embedded 930 Slide Gate

951 – Heavy-Duty Embedded 950 Slide Gate

Recent Stainless Steel Gate Water Control Equipment News & Updates