DeZURIK
APCO CSD-800 Slanting Disc Check Valves
D12012
Page 4
July 2017
Description
A slanting disc check valve consists of a 2 piece valve body, a disc connected to a pivot pin, and a seat
ring held between the 2 piece body. The disk swings away from the valve-seat to allow flow in the
forward direction, and returns to valve-seat when upstream flow is stopped, to prevent backflow.
The CSD-800-BMB valve is equipped with a Bottom Mounted Buffer. The CSD-800-TMD valve is
equipped with a Top Mounted Oil Dashpot.
Handling and Storage
Lifting the valve improperly may damage it. Do not fasten lifting devices to piping, attached
components, the
cylinder or through the seat opening in the body. Lift the valve with
slings, chains or
cables fastened around the valve body, or fastened to bolts or
rods through bolt holes in the flanges.
If installation will be delayed, place valve indoors in secure, weather tight storage. If temporary outside
storage is unavoidable, make sure a vermin proof rain cover (water shedding tarp, etc.) is secured
around/over the valve to keep off rain and mud. Skid and set the assembly on a flat, solid, and well
drained surface for protection from ground moisture, runoff and pooled rain water.
Installation
The APCO CSD-800 Slanting Disc Check Valve may be installed in a horizontal position.
Contact DeZurik if installed in vertical position with the flow upward. The embossed flow arrow
on the valve body should be pointing in the direction of flow. In all cases however, with the CSD-
800-BMB, the tanks (27) and (32) must always be in the upright position with piping from the
dashpot cylinder (39) entering at the bottom of the tanks (see Figure 1.) With the CSD-800-
TMD, the tanks (73) and (74) also must always be in an upright position (see Figure 2.) Unless
otherwise specified, the valves are shipped for horizontal installation.
Before installation, remove foreign material such as weld spatter, oil, grease, and dirt from the
pipeline.
Prepare pipe ends and install valves in accordance with the pipe manufacture’s instructions for
the joint used.
Do not deflect the pipe-valve joint. Minimize bending stresses in the valve end
connection with pipe loading.
If excessive seat leakage occurs during start-up, recheck the installation and
eliminate any distortion to the valve body.
Ensure the valve and pipeline flanges are concentric to ensure proper flange sealing and seat
leakage control.
Tighten the flange bolts or studs in a crisscross pattern and minimum of four stages.