Flowserve Swing Check Valves 2.5-24 Bedienungsanleitung PDF herunterladen (Seite 7)

Swing Check Valves FCD ADENIM0013-00

1.0 VALVE DESCRIPTION

(Continued)

1.3 Design Features

1.3.1 Bonnet Seals

Anchor/Darling swing check valves are supplied with two basic types of body/bonnet closures; bolted

bonnet or pressure seal. The bolted bonnet closure (Fig. 2) is a bolted flange tongue and groove joint

with a gasket generally comprised of spiral-wound stainless steel and asbestos filler. The seal

depends upon the bolt preload to maintain sufficient compressive force on the gasket.

Pressure seal type closures (Fig. 3) utilize a tapered soft metal ring gasket for sealing. The gasket is

contained within the body neck bore by a retaining ring. The tapered inner surface of the gasket bears

against a mating angular surface on the valve bonnet. Under internal pressure, the bonnet is forced

against the pressure seal gasket, wedging it against the body neck wall. A slight interference angle

produces a line contact and high sealing pressure. The greater the valve pressure, the tighter the

metal-to-metal seal. No bolting is required to maintain the seal although the bonnet is initially drawn

into contact with the pressure seal by cap screws.

Figure 2 Figure 3

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Flowserve Swing Check Valves 2.5-24 Bedienungsanleitung Seite 7