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521 – Stainless Steel Embedded Stop Gate

The 521 Stainless Steel Stop Gate is an embedded stainless steel design that provides long-term, low-leakage performance in demanding environments. Its rugged construction and welded handles allow for dependable installation and removal.

Series	500 Series
Type	Gates & Flow Control
Category	Stop Gate
Mounting Configurations	Embedded Mounting
Materials	Stainless Steel
Size Range	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

For applications requiring maximum strength and long-term corrosion resistance, the 500 Series Stainless Steel Stop Gates from Whipps, Inc. deliver dependable water containment in ponds, tanks, channels, and treatment facilities. Built with rugged stainless steel construction, these gates are engineered for durability while still maintaining easy installation, removal, and reliable performance.

Every stainless steel stop gate is fitted with welded handles and UHMW seat/seals to ensure tight, low-leakage performance. Designed for versatility, the 500 Series offers models tailored to different mounting configurations, making them a reliable choice for both standard and specialized applications.

Model Differences: 521 vs. 523 vs. 523-C

The stainless steel line includes three models designed for specific mounting arrangements:

Model 521 – An embedded stainless steel stop gate, ideal for installations where permanent embedding is required. Engineered for low leakage and smooth installation or removal, it provides long-term performance in demanding environments.

Model 523 – The standard stainless steel stop gate, designed for flexibility with various options. Built for easy installation and custom details, it offers durability without sacrificing handling ease.

Model 523-C – A channel-mounted stainless steel stop gate that balances stability and ease of operation. Simple to install and remove, it maintains low leakage rates while providing the strength and resilience of stainless steel.

With precision fabrication and a focus on performance, Whipps, Inc. Stainless Steel Stop Gates deliver the rugged strength needed for harsh or high-demand environments. From embedded installations to channel-mounted systems, these gates provide reliable, long-lasting water control backed by Whipps’ decades of engineering expertise.

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.

Product Categories & Tags

All Series

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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Mounting Configurations

521 – Stainless Steel Embedded Stop Gate

The 521 Stainless Steel Stop Gate is an embedded stainless steel design that provides long-term, low-leakage performance in demanding environments. Its rugged construction and welded handles allow for dependable installation and removal.

General Information

Model Differences: 521 vs. 523 vs. 523-C

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