19
Top-Transfer 2" Angle Valves A-720, A-721, A-721-B and A-724 Series
Figure 7-1 Reassembly Steps 7.2.1 through 7.2.7
7 VALVE REASSEMBLY AND TESTING PROCEDURES
7.1 CLEANING
NOTICE:
Do not use solvents or grease lubricants that are incompatible with the products in the tank.
For example, a petroleum-based grease may cause a chemical reaction when it comes in contact with chlorine.
Contact your supervising engineer for suitable cleaning and lubricating material recommendations.
O-rings and metallic parts that fit together should be lightly greased.
7.2 REASSEMBLY PROCEDURE
NOTICE
7.2.1
Place the lower spacer with wiper (item 10) in the body (item 4) with the wiper side up; see Figure 7-1.
7.2.2
Put the spring (item 5) in the body; see Figure 7-1.
7.2.3
Install the upper (curved) packing washer (item 9) in the body, with the convex side up; see Figure 7-1.
7.2.4
The 2" valve use four (x4) Teflon
™
V-rings (item 11) in the body; see Figure 7-1.
7.2.5
Insert the stem seal (item 12) with Teflon
™
insert in the packing screw (item 8); see Figure 7-1.
7.2.6
Thread the packing screw into the body by pushing down against the spring and turning clockwise to engage the thread.
Wrench tighten a couple of turns.
7.2.7
Screw down the packing locknut (item 21) a couple of threads on the packing screw); see Figure 7-1.
Packing Locknut
(Item 21)
Stem Seal
(Item 12)
Packing Gland
(Item 11)
Spring
(Item 5)
Packing Screw
(Item 8)
Packing Washer
(Item 9)
Spacer with Wiper
(Item 10)
