Allsen Check Valve
Swing Check Valve
Self-actuated and designed to prevent reverse flow, these valves feature a disk or ball that opens with fluid pressure and seats to close when flow stops.
Their design is characterized by an unobstructed passageway with a full-opening capability to minimize flow resistance.
Available in various configurations, including swing type for larger sizes and lift type for NPS < 2″, with options for bolted cover or pressure seal designs based on pressure class
1. BODY & COVER:
Bodies and covers are high-quality cast and, afterwards, precisely machined, directing the attention to prevent stress concentration. The design characteristic of check valves is the unobstructed passageway, with a full opening when required.
2. BODY & COVER GASKETS:
The design of the body/cover gasket varies depending on the class of the valve. Class 150 to 600 check valves consist of a male-female connection with a graphite or spiral-wound gasket. Class 900 and above check valves consist of a ring-type joint. In pressure-seal designs, the sealing is achieved through a gasket that takes advantage of the internal pressure of the line. The material most commonly used is high-purity graphite located between the body and the body retainer ring.
SPECIAL FEATURES
Design and Manufacturing: BS 1868
Inspection and Testing: API 598, BSEN 12666 PART 1 & 2
End Flange Dimensions: ASME B 16.5 (for NPS ≤ 24″) Series A & B (for NPS ≥ 24), MSS SP – 44 (for NPS ≥ 24)
BW End Dimension: ASME B 16.25
Face-to-Face & End-to-End Dimension: ASME B16.10, BS2080
Gasket Design: ASME B 16.20
Disk Design: Gravitational acceleration
TOLERANCE
Face to Face : ± 2.0mm for NPS ≤10″&±3.0mm for NPS>10″
DESIGN FEATURES
Counterweight arrangement
Hydraulic Cylinder Arrangement
IBR Certified
NACE MR 0175 & MR 1030
Lift-type check valves will be supplied for the sizes for NPS < 2″. The rest of the sizes are in a swing-type design.
