Flowserve VRA Durametallic User Manual
Durametallic® VRA & VRA-C Series
Outside balanced seals designed to operate
under relatively high pressures and low speeds
Installation
Instructions
Experience In Motion
1 Equipment Check
1.1 Refer to Figure 1 for shaft, sleeve and seal housing requirements.
Seal Chamber Requirements Figure 1
Shaft or sleeve OD
±0.025 mm
(±0.001 inch)
To rst
obstruction
Face of seal housing/vessel
to be square to the axis of
the shaft to within 0.5 mm
(0.020 inch) FIM and have
a 1.6 µm (√ 63 µinch) Ra
nish or better
• Bearings, drive, and coupling must be in good condition
• Maximum axial movement of shaft (end play) = 0.25 mm (0.010 inch) FIM
• Maximum combined shaft concentricity and shaft deection at face of housing
total = 03.8 mm (0.150 inch) FIM
1.2 Refer to assembly drawing included with seal package for specic seal design,
materials of construction, dimensions, and piping connections.
1.3 Check shaft or sleeve OD, box bore, and box depth to ensure that they are
dimensionally the same as shown on the seal assembly drawing.
1.4 Check gland pilot and bolt holes to ensure they are adaptable to the equipment and
are the same as shown on the assembly drawing.
1.5 Seal Faces: While all seal parts are manufactured to precise tolerances, the seal
faces (stationary and rotating face) are of primary importance. These two sealing
faces are lapped at to three light bands or better (34.8 millionths of an inch) and
polished. It is imperative that these two faces be handled with care and kept perfectly
clean.
1.6 Do not apply oil or other lubricants to the seal faces or to the secondary seals.
1.7 Lightly lubricate the rotating face gasket and the O-ring on seal drive ID with a
lubricant compatible with the application and elastomer materials.
2
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