Flowserve Dual Pressurized Seals - Manual (Page 5)

5
3.6 Install the rotating seal assembly on the shaft or sleeve:
• Inner rotating face with rotating face gasket O-ring, V-ring, or Duraflon wedge.
• Seal assembly.
• Outer rotating face with rotating face gasket O-ring, V-ring, or Duraflon
wedge.
The rotating face sealing or rubbing surfaces should be facing away from the
springs and toward the stationary face. Be sure that the seal drive ring drive pins
engage the drive slots in the seal rings.
The RO, PTO, and similar designs have unitized seal assemblies, they can most
easily be installed on the shaft or sleeve as a unit with the rotating face gasket O-
rings in place in the bore of the rotating face. The BRO, MRO, and similar designs
are generally larger in diameter and the rotating seal parts are most easily installed
as individual components.
Handle Duraflon V-rings, wedge rings, Durafite, and Duraflex with extreme care.
Duraflon V-rings must be assembled individually and not pushed on the shaft or
sleeve while they are part of the rotating face or rotating seal assembly. Avoid
nicking or pinching either lip of the V-ring. Use both V-rings, they work together to
form an effective seal.
Position the rotating seal assembly in its final axial position with the indicated
position of the seal drive lined up with Scribe Mark B. Tighten the seal drive set
screws firmly and evenly.
3.7 Lubricate the other stationary face gasket O-ring or Duraflex ring with the
silicone lubricate provided and nest this O-ring in the gland cavity. Press the
outer stationary face into the gland with the sealing surface orientated toward
the inboard side of the gland. Use hand pressure only.
3.8 Position the gland over the shaft or sleeve with the stationary face sealing surface
orientated toward the seal chamber (stuffing box) and the gland or stationary pilot
properly engaged. Do not bump the stationary face against the shaft as it may chip,
crack, or break. Tighten the gland stud nuts evenly, cross stagger the adjustment
of the nuts. Follow the equipment manufacturer's recommendations for gland
stud nut torque. In the absence of recommendations, gland nuts should only be
torqued to establish a leak tight seal at the gasket. Proper gland bolt adjustment is
especially important with clamp style stationary faces where excessive torque may
damage the face.
3.9 Reassemble the pump.
3.10 See Section 5, Operational Recommendations, before starting pump.