Emerson Daniel 788DVC User Manual page 79

User manual
P/N 3-9008-556
3. Install the indicator guard on the indicator adaptor and secure it with the
9.4.3 AP cylinder reassembly
Procedure
1. Protect the cup-seals against damage or distortion of any kind.
2. Install cup-seals with the closed ends facing "in".
3. Cup-seal installation:
Retrofit a control valve
Applications requiring aggressive products need control valve modification. Use the
following specific valve retrofitting procedure for these petroleum blending operations.
Upgrade existing AP units supplied prior to September, 1992
Three O-rings are supplied as a separate kit to upgrade existing valves, which have the
original AP option (received prior to September 1992).
Procedure
1. Follow the procedures described in
2. Replace O-rings as required.
3. Complete the cylinder assembly by installing the piston and all the component
4. For ease of installation, secure cylinder assembly to cylinder heads using hand
User manual
lockwashers and screws. Replace the two jack-out screws.
• Place the inside edge of the bottom seal in the deep recess of the piston body
(below the seal's resting position) and carefully pull seal into position. Adjust
cup-seal position into its proper location.
• Ensure that the closed ends of the top cup-seal face "in" (back-to-back).
general disassembly and
reassembly.
parts through the top of the cylinder housing.
Important
Do not attempt to install the piston through the seat area. This will destroy the
spring-loaded Teflon cup-seals.
pressure or arbor press.
WARNING
DISASSEMBLY HAZARD
When performing any disassembly procedure caution is required as the cylinder
head is bolted to a spring loaded cylinder assembly. Service should only be
performed by trained and qualified service personnel.
Failure to follow these instructions could result in death, serious injury or damage
to the equipment.
Disassemble/Assemble the control valve
AP cylinder reassembly for aggressive products cylinder
Planned maintenance
October 2019
for
79