Flange Requirements:
DEI’s resilient seated (RS) valves are designed for installation between ANSI Class 125/150 flat or raised faced flanges. Gaskets are not required. Lined pipe, heavy wall pipe or flanges must have a minimum allowable inside diameter at the centered body face to clear the disc sealing edge when opening the valve.

Storage:
The valves should be stored on a pallet or “skid” in a clean, dry warehouse. If the valves must be stored outside, the following apply:
1. Valves must be kept off the ground high enough to avoid standing water.
2. Cover the valves with a water repellant cover (not included with valve).

Maintenance:
Routine maintenance or lubrication is not required.

Installation Instructions:
DEI’s resilient seated (RS) valves are bidirectional and will control flow equally well in either direction. For the best results in slurry service regarding sedimentation, position the valve assembly so that the valve stem is in the horizontal position and the lower disc edge opens downstream. This will create a self-flushing effect, thereby extending the service life of the valve.

Consideration should be given to the location of the valves in the piping system. The valve should not be placed too close to other valves, elbows, etc. as its performance may be affected. It is recommended that the valve have a minimum of six pipe diameters upstream (see Figure 1) and four pipe diameters downstream between it and other valves, elbows, etc. in the piping system. (See Figures 4 – 10 on pages 5 – 8 for pump applications, elbows, pipe reduction and other special applications).

Installation Between Pre-Existing ANSI Flanges:
1. Observe that the disc sealing edge is in line with the parallel flats (or keyway) on the stem. Rotate the stem clockwise to position the disc within the body at least 3/8” away from the body face.
2. Spread the flanges to exceed the valve’s face-to-face dimension by 3/16” before placing the valve in position to prevent distortion and/or damage to the seating face of the seat.
3. Center the valve body between the flanges and span the valve body with all flange bolts possible. Turn the disk to the fully open position.
4. While gradually removing the flange spreaders, center the valve body to the flanges and tighten the bolting hand tight. Slowly close the valve to check for adequate disc clearance.

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