Swing Check Valves - Api Std. 6d And 600 Compliant | Low Pressure Drop, Suitable For Vertical And Horizontal Piping

Swing Check Valves are manufactured to API Std. 6D and API Std. 600, and tested to API Std. 598.

These Swing Check Valves are used to prevent flow reversal in piping systems. They are suitable for service in horizontal or vertical (flow up through valve only) piping turns . These Swing Check Valves have low pressure drop and are best suited for moderate velocity applications.

BODY
Its spherical form of large radius allows for the stresses. Turbulence and resistance to flow to be kept to a minimum.

BODY-BONNET JOINTS
Body-Bonnet Joints of check valves are machined as follows :
On 150 and300 classes ; male and Female.
On 600, 900 and 1500 classes : RTJ

SEAT RINGS
Seat ring are manufactured in two different ways, depending on the class and type of valves:
* Screwed seat rings, bottom seated type lapped on both side. They are dry assembled, with a controlled torque setting to t body.
* Welded-in seat rings, designed in order to prevent any turbulence and avoid damages due to corrosion
* Both are forged or rolled in one piece, for all dimensions. They are heat treated to obtain the requested surface hardness, and are perfectly cleaned before assembling.

INSERT SEAT RINGS
These rings are manufactured with PTFE or viton inserts, depending on fluid and service conditions.

They provide an elastometer primary seal. combined with a fire sale metal to-metal secondary seal, for temperatures from - 100oC (-144oF) to 204.4oC (400F) [fig. A]