Yoshitake PD-3 User manual

■EPDT-310■
MODEL PD-3
AIR OPERATED VALVE
PRODUCT MANUAL .
Thank you very much for choosing the Yoshitake’s product. To ensure the correct and safe use of the
product, please read this manual before use. This manual shall be kept with care for future references.
The symbols used in this manual have the following meanings.
Warning
This symbol indicates a potentially hazardous situation that, if not avoided,
could result in death or serious injury.
Caution
This symbol indicates a hazardous situation that, if not avoided, may result in
minor or moderate injury or may result in only property damage.
Table of Contents
1. Usage of the Product·················································· 1
2. Specifications···························································· 1
3. Dimensions and Weights············································· 2
4. Operation ······························································· 3
5. Installation ······························································ 4
5.1 Piping example ·················································· 4
5.2 Precaution for installation ···································4-5
6. Operating procedure ················································· 5
6.1 Warning and caution for operation ·························· 5
7. Maintenance ···························································· 6
7.1 Maintenance ······················································ 6
7.2 Troubleshooting·················································· 7
7.3 Exploded view····················································· 8
7.4 Disassembly and reassembly ····························· 9-10

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■EPDT-310■
1. Usage of the Product
PD-3 is air operated ON-OFF valve for wide usage application.
2. Specifications
*1 When fluid is steam, maximum working pressure is 1.5 MPa.
*2 Available with normally open type (pressure to close).
●For the specification other than the above, please contact us.
Caution
Please confirm that the tag indication of the product corresponds with the
specifications of the ordered product model before use.
* If they are different, please contact us without using the product.
Model PD-3
Application Steam, air, cold and hot water, oil, other non-dangerous fluid
(600cSt or less)
Nominal size 15A to 50A
Working pressure
15A：0 to 2.2MPa *1 20A：0 to 1.3MPa
25A：0 to 0.9MPa 25A：0 to 2.2MPa *1
32A：0 to 1.2MPa 40A：0 to 1.0MPa
50A：0 to 0.75MPa
Pilot air pressure
15A：0.35 to 1.0MPa 20A：0.45 to 1.0MPa
25A：0.57 to 1.0MPa 25A：0.35 to 1.0MPa
32A：0.35 to 1.0MPa 40A：0.44 to 1.0MPa
50A：0.56 to 1.0MPa
Temperature
range -30 to 200℃(no freezing condition)
Ambient
temperature range -15 to 60℃
Material
Body Stainless steel
Valve disc PTFE
Bonnet Brass + chrome plating
Installation posture Any direction is possible.
Connection JIS Rc screwed
Operation Normally close (pressure to open)
Cv value 15A：4 20A：9.2 25A:17.4 32A：27.8 40A：40.6 50A：63.8

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3. Dimensions and Weights
No. Parts name
1 Body
2 Packing case
3 Gasket
5 Valve disc
20 Bonnet
22 Circlip
23 Piston
24 Exterior lip seal
26 Spring
27 Position indicator
(mm)
Size Working Press.
(MPa)
Pilot
Press.
(MPa) d L A H B D G Weight
（kg)
15A 0-2.2 0.35-1.0 Rc 1/2 65 135 130 34.5 62 G 1/8" 1.1
20A 0-1.3 0.45-1.0 Rc 3/4 75 140 135 34.5 62 G 1/8" 1.2
25A 0-0.9 0.57-1.0 Rc 1 90 150 140 34.5 62 G 1/8" 1.4
25A 0-2.2 0.35-1.0 Rc 1 90 190 185 55 96 G 1/4” 3.0
32A 0-1.2 0.35-1.0 Rc 1 1/4 110 205 200 55 96 G 1/4" 3.3
40A 0-1.0 0.44-1.0 Rc 1 1/2 120 210 205 55 96 G 1/4" 3.6
50A 0-0.75 0.56-1.0 Rc 2 150 225 215 55 96 G 1/4" 4.2
Fig.1
Position indicator
Actuator
Pilot port

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4. Operation
1. Closing operation (normal state)
When pilot pressure is not applied, valve disc [5] is closed by power of spring [26].
2. Opening operation
When pilot pressure is applied from pilot port, pressure is added to bottom part of piston
[23], and overcome load of spring [26] and push up piston [23] and open valve disc [5]. Also,
position indicator [27] connected to piston [23] is pushed up at the same time, then valve
opening can be checked from outside visually.
Pilot port
Pilot port
⑤
26
⑤
23
26
27
Fig.2
Fig.3

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5. Piping example
5．1 Piping example
5.2 Precaution for installation
Caution
1. Do not disassemble the product unless it is necessary.
* Failure to follow this notice may prevent the product from functioning properly.
2. Before installing the product in piping, be sure to remove foreign substance and scale from the piping.
* Failure to follow this notice may prevent the product from achieving its intended performance and lead
to malfunction due to the ingress of foreign substances and scale into the product.
3. Be sure to install a strainer (60 mesh or equivalent) at the inlet side of the product.
* Failure to follow this notice may prevent the product from achieving its intended performance and lead
to malfunction due to the ingress of foreign substances and scale into the product.
4. Install stop valve and bypass piping for the product.
* Failure to follow this notice may prevent the product from maintenance and inspection.
5. When installation, check the direction of the product so that the fluid flowing and the arrow marked on
the product are in the same direction.
* Failure to follow this notice may prevent the product from functioning properly.
6. Connect the product to piping securely so that fluid cannot leak.
* Insufficient connection may lead to leakage by vibration.Also, high temperature fluid can cause scald.
* If using seal agent for piping to connection part, prevent it from commingling into the product. Seal
agent commingles into the product may hamper proper operation.
7. If there is possibility of freezing, take measures to prevent fluid from freezing.
* Failure to follow this notice may damage the product due to freezing of the product.
8. Install pipes so that excessive load, torque or vibration cannot be applied to the product.
* Failure to follow this notice may lead to malfunction or drastically shortened service life of the product.
9. When connecting the product to piping, connect it by grasping hexagonal part of inlet and outlet sides
of the body with tool. Do not screw the product into piping with grasping the actuator part.
10. Be sure to secure enough space required for maintenance.
* Failure to follow this notice prevents required operation at the time of maintenance.
11. Install pilot pressure piping and valve to operate the product so that excessive load, torque or vibration
cannot be applied to the product.
* Failure to follow this notice may lead to malfunction or drastically shortened service life of the product.
12. Before driving piping equipment, check if the product functions properly.
13. For installation posture, any direction is possible.
14. Compressed air to supply to actuator should be clean and dry air without commingling of water, oil, or
foreign substances.
* Commingling of foreign substances leads to malfunction of the product.
Fig. 4

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Minimum maintenance space for disassembly
6. Operating procedure
6.1 Warning and caution for operation
Warning
1. Do not touch the product with bare hands in case of high temperature fluid.
* Failure to follow this notice may scald your skin.
2. Before letting fluid flow, be sure to check that there is no danger if fluid flows to end of piping, the
product is connected firmly, and pilot pressure piping is connected firmly to pilot port.
* Failure to follow this notice may contaminate the surroundings. Also, fluid with high temperature may
scald your skin.
Caution
1. Before leading fluid into the product, close the stop valves at the inlet and outlet of the product and
remove foreign substances and scale from the piping completely by using a bypass line.
* Failure to follow this notice may prevent the product from functioning properly due to the ingress of
foreign substances and scale into the product. Also, foreign substance stuck inside the product leads
to malfunction.
2. Open each stop valve in the piping to avoid water hammer or condensate obstruction when leading
fluid to the product.
* Rapid opening of stop valve may break the product or peripheral equipment by water hammer or
condensate obstruction.
3. If fluid leakage from piping connection part of the product is found after leading fluid to the product,
stop the fluid immediately and discharge innerpressure of theproduct, piping and peripheral equipment,
and retighten piping connection (for fluid with high temperature, after cooling the product).
* Failure to follow this notice may result in making the surroundings dirty. Also, fluid with high
temperature may scald your skin.
(mm)
Size H1L2
15A 200 200
20A 210 210
25A 220 220
32A 280 280
40A 290 290
50A 310 310
Fig. 5

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■EPDT-310■
7. Maintenance
Most of problems with the product are caused by foreign substances and scale in the piping.
A phenomenon similar to valve failure could occur due to the failure of the pressure gauge,
leakage or insufficient tightening of the stop valve in the by-pass line, clogging of the strainer,
and other causes. Check the above possible causes and take a proper remedy and preventive
measures specified in “7.2 Troubleshooting”.
7.1 Warning and inspection for maintenance and inspection
Warning
1. Conduct periodic inspection to maintain functions and performance of the product.
* General users should ask experts (staff of facility management/engineering companies, etc.) to
perform periodic inspection.
2. When conducting disassembly or inspection, be sure to discharge inner pressure of the product, piping
and equipment, and cool down the body of the product until it can be touched by bare hands. Do not
touch it with bare hand directly till it is cooled completely.
* Failure to follow this notice may result in scalds or injury due to the residual pressure. Also, it may
make the surroundings dirty.
Caution
1. Completely discharge the fluid inside of the product and piping before leaving the product not operated
for a long time or at the time of regular inspection.
* Failure to follow this notice may cause malfunction due to occurrence of foreign substance or scale
inside of the piping.
2. After leaving the product not operated for a long period, perform periodic inspection before start-up of
operation.
7.1.1 Consumable parts and replacement term
For consumable parts, service life differs according to frequency of usage or usage
condition. Rough indication of replacement term is as follows (parts number in the chart
indicates number in “7.3 Fig.3 Exploded view”):
Parts name Parts number Replacement term
Gasket 3 3 years
7.1.2 Regular inspection items and period to maintain function and performance
Regular inspection items and period are as follows:
Inspection items Inspection period
Leakage check (visual check) with
conducting open and closing operation
More than once a year
Leakage check (visual check) from leak
detection port (see Fig.6) More than once a year
Leakage check (visual check) from
position indicator (see Fig.1) More than once a year

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7．2 Troubleshooting (see “3. Dimensions and Weights”, “7.3 Exploded view” and “7.4
Disassembly and reassembly”.)
Trouble Cause Remedy
1. Fluid does not
flow (Valve disc is
kept closing and
does not open).
Pilot pressure is not supplied. Check air supply piping.
Pilot pressure is low. Apply pilot pressure as specified in “2.
Specification”.
Sealing defect of outer lip seal [24]. Replace the actuator set.
2. Fluid keeps
flowing, does not
stop. (Valve disc is
kept opening and
does not close.)
Or, there is valve
leakage.
Leakage from stop valve on bypass
piping.
Close stop valve. Or, leakage still
occurs even if closing stop valve,
replace stop valve.
Pilot pressure exists inside the bonnet. Remove pilot pressure from pilot port.
Foreign substance is stuck on the seat
part (see Fig.7) between valve disc [5]
and body [1].
Clean the seat part (see Fig.7)
between valve disc [5] and body [1].
There is damage on the seat part (see
Fig.7) between valve disc [5] and body
[1].
If there is damage on valve disc [5],
replace the actuator set. If there is
damage on the seat part (see Fig.7) of
body [1], replace the product.
Defect of spring [26] inside actuator. Replace the actuator set.
3. Fluid leaks
from the
connection part of
packing case [2]
and body [1].
Leakage from gasket due to loose of
packing case [2]. Tighten packing case [2] until the specified tightening torque.
Leakage from gasket [3] due to
deterioration. Replace gasket [3].
4. Fluid leaks
from the leak
detection port (see
Fig. 6). Leakage due to deterioration of O ring
or packing, etc. inside the actuator set.
Replace the actuator set.
5. Pilot pressure
leaks from position
indicator part.
Leak detection port
Fig. 6

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7．3 Exploded view
Fig. 7 Exploded view
The parts names shown in
are available as consumable supply.
Pilot port
Position indicator
Actuator set
Circlip
Packing
case
Valve
disc
③
Gasket
Seat part
① Body

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7.4 Disassembly and reassembly
7.4.1 Disassembly
7.4.1.1 Warning before disassembly
Warning
1. Be sure not to remove circlip [22]. (See “3. Dimension and Weight.)
* Failure to follow this notice makes inner spring [26] fly out and result in injury.
2. To remove actuator set from body [1], supply pilot pressure to pilot port, and rise valve disc [5]. Then
loose and remove actuator set by grasping hexagonal part of packing case [2]. Also, be sure not to
stop pilot pressure during supply till the work is finished.
* Actuator set cannot be removed when pilot pressure is not supplied to pilot port. Also, it is very
dangerous to stop pilot pressure during supply at work because actuator set flies out from body [1]
and result in injury.
3. Before disassembly, be sure to discharge the pressure inside of the product, piping and equipment
completely (after cooling down the product in case of high-temperature fluid). Also, do not touch it with
bare hands directly till it is cooled.
* Failure to follow this notice may make the surroundings dirty or result in injury or burns due to residual
pressure if inner pressure is not discharged completely from the product, piping and equipment.
7.4.1.2 Disassembly procedure
1. Adding pilot pressure through pilot port, check that valve disc is up by position indicator
[27].
2. Grasp and loose hexagonal part of packing case [2] with spanner, and remove actuator
set from body [1].
3. Remove gasket [3].
7.4.2 Reassembly
7.4.2.1 Warning and caution for reassembly after disassembly
Warning
1. To install actuator set on body [1], supply pilot pressure to pilot port, and rise valve disc [5] and then
tighten actuator set by grasping hexagonal part of packing case [2]. Also, be sure not to stop pilot
pressure during supply till the work is finished.
* Actuator set cannot be installed on body [1] when pilot pressure is not supplied to pilot port because
valve disc is down. Also, it is very dangerous to stop pilot pressure during supply at work because
actuator set flies out from body [1] and result in injury.
Caution
1. Check that there is no damage on valve disc [5] and seat part of body.
* Damage on valve disc or seat part of body leads to valve leakage. Also, replace gasket [3] with new
one. If not, it leads to outside leakage.
* For gasket, be sure to use gasket which Yoshitake prepares. If using other gasket, it may leads to
outside leakage.
2. For operation after reassembly, follow “6.1 Warning and caution for operation”.

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7.4.2.2 Reassembly procedure
1. Supply pilot pressure to pilot port of actuator set.
2. Put new gasket [3] to body [1] and then put actuator set.
3. Tighten packing case [2] with torque indicated in “7.4.3 Recommended torque for actuator
set”.
4. After the reassembly, be sure to check opening and closing operation and that there is no
leakage from gasket [3].
7.4.3 Recommended torque for actuator set
To install actuator set on body, tighten so that appropriate pressure can be applied on
gasket [3] with torque wrench. In this case, use tightening torque as follows:
Size Tightening torque
15A 60 Nm
20A 90 Nm
25A 120 Nm
32A 150 Nm
40A 190 Nm
50A 230 Nm