Yokogawa YVP110 - Manual (Page 40)

<6. Maintenance>
6-2
IM 21B04C01-01E
6.3 Part Replacement
6.3.1 Replacing the Control Relay
Assembly
(1) Decrease the air supply pressure to zero.
(2) Using a Philips screwdriver, unscrew the four
mounting screws on the bottom face.
(3) Pull the relay assembly downwards to detach it.
(4) To mount a new relay assembly, remove the
mounting screws and washers from the old
assembly and use them to mount the new
assembly in place by tightening them from
below.
(5) When using the Double Acting Type, adjust
the pressure balance of the control relay as
required (in reference to Section 6.3.4).
After completing the replacement of the control
relay assembly, carry out tuning and check the
valve’s actions (in reference to Sections 5.3 and
5.4).
F0603.ai
Washer
Mounting screw
Figure 6.3 Replacing the Control Relay Assembly
CAUTION
For the Double Acting Type, the recommended
replacement cycle for the control relay is either
when the actual repeat cycle exceeds 500,000
times, or after the control relay has been in use
for 6 years.
6.3.2 Replacing the Screen Filters
When the screen filters installed deep in the air
supply port and output pneumatic signal port
become clogged, replace them with new filters
using a tool with pointed tips such as a set of
tweezers.
F0604.ai
Filter
Filter
(Only for Double Acting Type.)
If the air supply port at the
back side is used, change
the filter in that port.
Figure 6.4 Replacing the Screen Filters
6.3.3 Replacing the Internal Air Filter
An air filter is provided at the opening to the internal
pneumatic circuits. Follow the procedure below to
replace it.
(1) Decrease the air supply pressure to zero.
(2) Remove the relay assembly (in reference with
Section 6.3.1).
(3) Remove the pneumatic circuit holding plate and
gasket*. (*two gaskets for Double Acting Type)
(4) Remove the air filter and O-ring.
(5) Set the new filter in place.
(6) Perform steps (3), then (2) to restore the
YVP110 to its original state.
F0605.ai
Air filter
O-ring
Figure 6.5 Replacing the Internal Air Filter