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Planned maintenance
November 2020
Reassembly of a control valve with a microswitch-type
position indicator
Procedure
1. Place the valve in a vertical position with the head up. Place the indicator stem into
the center hole in the cylinder head, and press it into the retaining ring in the piston.
You may have to wiggle the indicator stem a little to get it into position. When the
indicator stem is in position, you will not be able to pull it out.
2. Install the indicator adaptor onto the cylinder head by turning the indicator guard
clockwise. Stack the O-ring, seat retainer, the O-ring retainer, O-ring in the upper
bearing, and place them onto the indicator stem.
3. Install the indicator guard on the indicator adaptor and secure it with the
lockwashers and screws. Replace the two jack-out screws.
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:
•
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).
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
cylinder reassembly
2. Replace O-rings as required.
3. Complete the cylinder assembly by installing the piston and all the component
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.
60
Section 8.3.1
for general disassembly and
for aggressive products cylinder reassembly.
USER MANUAL
User manual
P/N 3-9008-553
AP
Daniel Series 700 Control Valve
www.Daniel.com
51
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