Key features/benefits
Dual disc check valves are light and compact in comparison to standard check valves and have lower installation cost. Extensive range of materials, sizes and pressure classes are available. VASTAS dual disc check valves are produced in 3 basic body style which are Wafer type, Lug type, and Double Flanged type. In the Lug type, the through and threaded holes are optionally manufactured upon customers’ request. The ring joint – type is also available for both Lug type and Double Flanged type.
At pump start-up flowing fluid enters the valve from the seat end and forces the two disc to open fully, until they strike touch-on disc stop pin. When there is a counter flow or in pump shut-down cases, valve closes rapidly with help of the torsion springs.
It can be used instead of ‘tilting disc’ check valve. When compared with other check valves, it outstands with the ability to work in any connections, vertical-opposite, horizontal or inclined.
Pigging is not applicable.
Features
Wafer Type / Flanged Type
Long Pattern
Minimize Slamming
Low Pressure Drop
Standards
» Design API 6D, API 594, ISO 14313, ASME B16.34
» NACE MR0175, MR0103
» Flange end dimensions ASME B16.5, B16.47
Series A, Optional Series B
» F to F and E to E dimensions ASME B16.10, API 6D,
API 594
» Test Standard API 598
Operators
» Self Acting
Functions
SAV
