CHECK VALVES
Check valves permit flow in one direction only, and close automatically if flow reverses. They are entirely automatic in action, depending upon pressure and velocity of flow within the line to perform their functions of opening and closing.
Product Features
• Swing check valve, Bolted cover
• Renewable disc and seat (in S.S. construction, integral seat non renewable)
Standards
• PED
• Quality Standard MSS SP 55
• All wetted component materials meet NACE MR0175 / ISO15156 & NACE MR0103 /
ISO17945
• ATEX
Sectors
• Oil and Gas
• Chemical & Petrochemical
• Pulp & Paper
• Energy & Renewable
• Mining
• Waste Treatment
• special Fluids Transport
Body and 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.
Body and Cover Gasket
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 being located between the body and the body retainer ring.
