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500 Series – Stop Gates

Best Stop Gate For Minimal Leakage

Made in the USA since 1977

General Information

The 500 Series Stop Gates from Whipps, Inc. are a dependable, high-performance solution for water containment in ponds, tanks, channels, and other flow control structures. Designed for strength, reliability, and ease of use, these stop gates are a proven choice for operators who need effective water management without the complexity of larger gate systems. Built with robust aluminum or stainless steel construction, the 500 Series delivers long-lasting durability while remaining lightweight and easy to handle.

Our stop gates features precision-fabricated slides equipped with two welded handles, allowing operators to lift and position the gate manually. Thanks to its lightweight design, the gate can typically be installed or removed by one or two workers, making it well suited for applications where the gate is inserted and removed only occasionally. When not in use, the gate can be conveniently stored until needed again, ensuring flexible and efficient operation.

Whipps stop gates are engineered for durability and reliable sealing. All models incorporate ultra-high molecular weight polyethylene (UHMW) seat/seals, which provide a secure closure with minimal leakage of 0.10 gallons per minute per linear foot of wetted seal. This level of performance ensures consistent containment across a wide range of flow conditions while minimizing maintenance requirements. For added versatility, Whipps also offers stainless steel stop gates, designed for sites where additional strength and corrosion resistance are required to handle more demanding environments.

The aluminum models (501, 503, and 503-C) offer the ideal balance of rugged construction, corrosion resistance, and ease of handling. They are designed to perform reliably across a variety of flow control applications, from municipal systems and treatment plants to industrial facilities and irrigation structures. Combined with Whipps’ expertise in custom fabrication, the 500 Series Aluminum Stop Gates can be tailored to meet the exact needs of your installation, whether standard or specialized.

The stainless steel models (521, 523, and 523-C) deliver maximum strength, corrosion resistance, and reliable sealing performance for demanding applications. The 521 model is designed for permanent embedded installations, the 523 model offers flexible mounting options and other customizations, and the 523-C model provides a dedicated channel-mounted design for ease of operation and stability. Backed by Whipps’ precision fabrication and custom engineering, these stainless steel stop gates ensure dependable performance across municipal, industrial, and treatment facility installations.

Whipps, Inc.’s 500 Series Bulkhead Gates are built for heavy-duty performance in high head conditions and large waterways, combining rugged, reinforced construction with precision engineering. Available in aluminum (Models 519 and 519-C) or stainless steel (Model 529), these gates feature large extruded slides, resilient lip-type seals for reliable low-leakage performance, and frames designed with two grooves and an invert member to minimize flow interference. The 519 offers a durable aluminum design, the 519-C provides a channel-mounted aluminum option, and the 529 delivers maximum strength and corrosion resistance in stainless steel—making the series a versatile, long-lasting solution for demanding municipal, industrial, and treatment facility applications.

Supported by decades of engineering experience and precision manufacturing, Whipps, inc. 500 Series provide a reliable, cost-effective solution for water management. With their lightweight design, durable sealing system, and proven performance, our stop gates deliver the quality and dependability customers have come to expect from Whipps, Inc.

Product Advantages

Quality Assurance

The stop gate will be manufactured by a company with 10 years or more of successful experience in designing and producing low-leakage stop gates under similar design conditions. All welds will be executed by welders with AWS certification.

Performance

The maximum allowable leakage for the stop gates shall be 0.10 gallons per minute per linear foot of the wetted perimeter, regardless of the direction of the unbalanced head.

Technical Information

In addition to the submittal information required by other sections of these specifications, the stop gate manufacturer may need to submit design calculations and supporting data for all gates, illustrating stresses, loads, and deflection for critical parts under design head conditions. At a minimum, theses shall include operating load, slide deflection, slide bending stress, and shear stress in stiffener welds.

Frame

Constructed of 1/4” or thicker extruded aluminum (Alloy 6061-T6) incorporating ultra high molecular weight polymer (UMHW) seat/seal facing on both the upstream and downstream sides of the slide. Each seat/seal is shaped to provide two bearing surfaces and two sealing edges. The gate side guides and invert shall weigh a minimum of 4lbs/ft for wall mounted and 3lbs/ft for embedded installation. The gate invert shall include a removable neoprene seal. Seals attached to the slide will not be acceptable. All necessary assembly and anchor bolts shall be type 304 (type 316 optional) stainless steel and provided by the gate manufacturer.

Slide

The slide shall be minimum thickness of 1/4” aluminum plate (Alloy 6061-T6) reinforced with stiffeners as required ensure that at the design head, the slide will not deflect more than 1/360 of its width and stress is limited to 7600 psi. Slide stiffeners shall have a minimum weight of 2.5lbs/ft. The slide shall be equipped with a cast aluminum offset lifting handle. Gates wider than 36 inches shall be provided with dual lifting handles.

Painting

All aluminum in contact with concrete shall receive a heavy shop coat of bitumastic paint.

Anodizing (optional)

All aluminum components can be anodized in accordance with Aluminum Association Specification AA-C22-A41. The anodizing shall be 0.7 mm thick with a nickel acetate sealer.

3D Model of 521 Stainless Steel Embedded Stop Gate

501 – Aluminum Embedded Stop Gate

The Whipps 501 Aluminum Stop Gate is designed for embedded mounting, providing a secure and permanent fit within concrete structures. Its lightweight aluminum slide with welded handles makes it easy to operate while ensuring reliable, long-lasting water containment.

3D Model of 523 Stainless Steel Wall Mounted Stop Gate

503 – Aluminum Standard Stop Gate

The Whipps 503 Aluminum Stop Gate is a wall-mounted design that offers versatility and dependable sealing for a wide range of applications. With rugged aluminum construction and UHMW seat/seals, it delivers strength, corrosion resistance, and consistent performance.

3D Model of 523-C Stainless Steel Channel Mounted Stop Gate

503-C – Aluminum Channel Mounted Stop Gate

The Whipps 503-C Aluminum Stop Gate is built for channel-mounted installations, making it ideal for open-channel systems. Its lightweight, durable construction ensures easy handling and effective water control with minimal leakage.

3D Model of 501 Aluminum Embedded Stop Gate

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.

3D Model of 503 Aluminum Wall Mounted Stop Gate

523 – Standard Stainless Steel Stop Gate

The 523 Stainless Steel Stop Gate is a versatile standard model, available with various customizations. Built for durability and ease of handling, it delivers reliable water control across a wide range of applications.

3D Model of 503-C Aluminum Channel Mounted Stop Gate

523–C – Channel Mounted Stainless Steel Stop Gate

The 523-C Stainless Steel Stop Gate is a channel-mounted stainless steel design engineered for stability and smooth operation. Easy to install and remove, it ensures tight sealing performance with the strength of stainless steel.

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