Yoshitake PD-3 Product Manual
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Yoshitake PD-3 Product Manual

Air operated valve
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AIR OPERATED VALVE
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
Caution
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
MODEL PD-3
PRODUCT MANUAL
This symbol indicates a potentially hazardous situation that, if not avoided,
could result in death or serious injury.
This symbol indicates a hazardous situation that, if not avoided, may result in
minor or moderate injury or may result in only property damage.

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■EPDT-310■

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Summary of Contents for Yoshitake PD-3

  • Page 1: Table Of Contents

    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.

  • Page 2: Usage Of The Product

    1. Usage of the Product PD-3 is air operated ON-OFF valve for wide usage application. 2. Specifications Model PD-3 Steam, air, cold and hot water, oil, other non-dangerous fluid Application (600cSt or less) Nominal size 15A to 50A 15A：0 to 2.2MPa *1 20A：0 to 1.3MPa...

  • Page 3: Dimensions And Weights

    3. Dimensions and Weights Position indicator Actuator Pilot port Parts name Body Packing case Gasket Valve disc Bonnet Circlip Piston Exterior lip seal Spring Position indicator Fig.1 (mm) Working Pilot Weight Size Press. Press. （kg) (MPa) (MPa) 0-2.2 0.35-1.0 Rc 1/2 34.5 G 1/8"...

  • Page 4: Operation

    4. Operation 1. Closing operation (normal state) When pilot pressure is not applied, valve disc [5] is closed by power of spring [26]. Pilot port ⑤ Fig.2 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].

  • Page 5: Installation

    5. Piping example 5．1 Piping example Fig. 4 5.2 Precaution for installation Caution Do not disassemble the product unless it is necessary. * Failure to follow this notice may prevent the product from functioning properly. 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.

  • Page 6: Operating Procedure

    Minimum maintenance space for disassembly (mm) Size Fig. 5 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.

  • Page 7: Maintenance

    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.

  • Page 8: Troubleshooting

    7．2 Troubleshooting (see “3. Dimensions and Weights”, “7.3 Exploded view” and “7.4 Disassembly and reassembly”.) Trouble Cause Remedy Pilot pressure is not supplied. Check air supply piping. 1. Fluid does not flow (Valve disc is Apply pilot pressure as specified in “2. Pilot pressure is low.

  • Page 9: Exploded View

    7．3 Exploded view Position indicator Actuator set Pilot port Circlip Packing case Valve disc ③ Gasket Seat part ① Body The parts names shown in are available as consumable supply. Fig. 7 Exploded view ■EPDT-310■...
  • Page 10 * 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.
  • Page 11 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”.

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