
Dyna-Flo Control Valve Services Ltd.
Phone: 780 •469 •4000 Toll Free: 1 •866 •396 •2356 Fax: 780 •469 •4035 Website: www.dynaflo.com
Model 590 Control Valve
P-590M0620A 8
Operation, Parts, and Instruction Manual
PERIODIC INSPECTION
Special Equipment Required:
• Bypass or block valves.
Before You Begin:
• Read Safety Caution (Page 2).
• Use safe work practices and lock out procedures.
• Disconnect supply lines (air or gas), electric power, or control
signal to the actuator. Sudden movement of actuator can
cause damage or injury, make sure actuator will not operate.
• Vent any pneumatic actuator loading pressure and relieve
any actuator spring preload if present.
• Relieve process pressure and drain the process fluid from up
and down stream of valve.
• Be aware of potentially hazardous process material that may
be present in-line and in-valve. Isolate the valve from
process pressure. Use a bypass or block valve if necessary,
or completely shut off the process. For dual seal valves,
relieve internal pressure by removing the pipe plug (Key 37).
Refer to Figure 52 on Page 40.
Inspection Steps:
1Check for visible signs of leakage around all seal and
gasket areas.
2Check the valve for damage, especially damage caused by
corrosive fumes or process drippings.
3Clean and repaint the areas as required.
4Ensure all accessories, mounting brackets, and fasteners
are secure.
5Clean any dirt and foreign material from the valve shaft
(Key 17).
MAINTENANCE
NOTE: Shaft seals or live loaded packing and ball seals (Key
30) should all be inspected frequently for leaks, wear and
damage. Maintenance to the shaft seals or live loaded packing
can be made while the valve is still in-line, the actuator must
be removed for drive shaft (Key 17) seal/packing maintenance
(Refer to Page 32 for ACTUATOR REMOVAL instructions).
NOTE: Perform ball seal (Key 30) maintenance when the
control valve will not properly shut off. Ball seal maintenance
can be performed without removing the actuator from the
valve. Ball seal maintenance cannot be performed with the
valve in-line. When removing the valve from pipe line be sure
it is in the OPEN position, verify the valve is open using the
indicator scale (Key 24) before removing from line.
NOTE: When testing the seal integrity of the valve using the
pipe plug port (dual seal configuration), it is recommended that
the pipe plug (Key 37) be replaced by a hand valve. A hand
valve will allow valve pressure to be relieved safely during
seat leak rate testing. Refer to Figure 52 for pipe plug location.
Before You Begin:
• Read Safety Caution (Page 2).
• Determine if valve has shaft seals or live loaded packing
(Refer to Figures 44 & 51).
• Determine if valve is single seal or dual seal (Refer to
Figures 50 & 52).
• Follow Steps 2 – 5 of PERIODIC INSPECTION Before you
begin.
LIVE LOADED PACKING MAINTENANCE
NOTE: If the packing is leaking, proper tightening of the
packing may correct the leak. If re-tightening the packing to
the proper specifications does not stop the leakage, it will be
necessary to disassembly and remove the packing box parts in
order to inspect, repair, and or replace parts. For instructions on
packing removal only, refer to the DISASSEMBLY LIVE LOADED
PACKING section on Page 15.
1Refer to Figures 44 to 47 and check that the number and
orientation of the spring washers (Key 43) are correct for
the size of your valve.