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Sentry™ and Yale™ Closures
The Sentry™ closure design concept relies on a simple locking ring that slides withina groove machined into the outer flange or hub. When expanded to the closed position, the locking ring securely locks the door into position. This design methodology is proven within the oil and gas industry , provides distinct advantages of integral safety, and avoids the reliance on external clamps with combined screw thread expanders. Heavy-duty components are used to actuate the locking ring and are designed to withstand the rigors of long term operation. Components are designed and arranged to ensure secure retention of all hinge hardware and simplified handling by fabricators.
Sentry closures are available with the ASME ‘U ’ stamp and can be supplied in compliance with most international design codes.
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Sentry™ closure |
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Closure Operation
The Sentry closure operating cycle consists of removing the Pressure Alert/Safety Segment assembly and then rotation o the actuator lever. This simple operation contracts the locking ring sufficiently to clear the outerhub, allowing the door to be pulled open. Closing is simply a reversal of the operation.
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Closure Sealing
A key feature of the Sentry closure is the pressure energized lip seal.
Located within the face of the door (horizontal) or the hub (vertical )for protection, the seal is available in several materials to meet the demands of today’s pipeline industry. The increased contact of the sealing surface reduces stress loads and extends theclosure operating life. Designed to provide extended service life, the Sentry seal is a one-piece design consisting of an
integral elastomeric seal and an anti-extrusion spring molded into the body of the seal. |
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Closure Safety
Safety is a paramount in today’s industry and the Sentry closure not only provides speed of operation, but also the benefit of integral safety features that prevent unsafe operation. With the locking ring in the locked and closed position, internal pressure creates a seating force that physically traps the locking element between the door and outer hub, making it impossible for the door to open. This design characteristic is further enhanced by the integral Pressure Alert Valve(PAV) that threads into a pressures ensing port. A small removable segment of the locking ring is attached to the PAV forming a double safety feature and preventing accidental opening. Operation of the PAV provides positive indication as to the pressurized state of the pressure vessel.
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 A key feature of the Sentry closure is the pressure energized lip seal
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The Original Threaded Closure
Yale™ Figure 500
Over 60 years of reliable field service has made Yale closures the leader in the industry. With the original Figure 500 closure, Yale was first to develop the inherent safety and operating ease of a threaded closure. The Figure 500 closure design combines simplicity and reliability through the use of a rugged, modified ACME thread to fasten cap to the hub. The pressure seal is achieved by an O-ring set in the face of the hub. Figure 500 closures are manufactured in sizes 2"-14.
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 Yale Figure 500 Closure |
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Yale Figure 500R Closures
The Figure 500R was designed for larger diameter closure applications and are machined with a bevel seat. The bevel seat on the hub provides the operator an accurate stabbing section and reduces the risk for thread and seal damage. All Figure 500R closures also have a minimum of 3" thread length for greater safety and mechanical sealing integrity. The Figure 500R design is available in sizes 16"-54". Closure horizontal hinges swing left or right for sizes 16" and above.
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 Yale Figure 500R Closure
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Yale Figure 515 Closures
The Figure 515 flanged closure offers a bolted flange-to-flange configuration. A rugged ACME thread fastens the cap to the hub, making the Figure 515 the safest in the industry. The pressure seal is achieved by an O-ring set in the face of the hub. Figure 515 closures are available in diameter from 2"-42" and ANSI class 150 through 2500.
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 Yale Figure515 Closure
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Ellatec. Copyright 2014 |
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