Solenoid Operated Directional Valve -DSG03

Installation and Pump-Prime Mover Alignment

• The base for the electric motor and pump should offer sufficient rigidity. Vibration absorbing construction is recommended.
• Flexible tyacpe coupling is recommended to join the drive shaft of the prime mover and the pump shaft. (DO NOT USE tire shaped coupling) Shafts should be aligned within recommended TIR (Total Indicator Reading) 0.05 mm tolerance. However this may be affected by differences in connection methods and type of couplings. Please consult Tokyo Keiki in such case.
• Poor shaft alignment may cause shaft damage, heat and friction of bearings, leakage from oil seals, pump noise and vibration, etc. Thus shaft should be aligned with care.
• In principle, there should be no external radial or thrust loads on shaft ends. Please consult Tokyo Keiki if belt, chain, or gear couplings are to be used.

Piping and Filtration

• Suction pressure (gauge pressure)
  • Proper inlet suction pressures are +35~-16.7 kPa for mineral oil fluids and +35~-10.1 kPa for water glycol and phosphate ester fluids.
  • Suction pipe flow rate should be kept within 0.5~1.5 m/s.
• Filtration
  • On the suction side, a 150 µm or equivalent tank filter (suction filter) should be used.
  • On the delivery side, a full flow filter which provides filtration of less than 25 µm or bypass filter which provides filtration of less than 10 µm should be installed.
• Filter installation
  • When using an immersion type tank filter, please install filter so it is about 50~70 mm from the tank bottom to discourage ingress of contaminant precipitate. In the case of greatly fluctuating oil level, the installation should be designed so that air does not enter the filter.
• Suction, return piping
  • Stipulated suction pressure should be considered and suction resistance should be kept as low as possible.
  • Use large diameter pipe with as few bends as possible.
  • Height from pump suction port to tank standard oil level should be less than 1 m.
  • Distance from suction piping end to tank bottom should be more than 50 mm.
  • Air in system causes noise, vibration, and parts damage. As air can easily be drawn in through suction piping, care should be paid to ensure that joints, especially, are airtight.
  • The end of the return pipe should always be below the oil level regardless of fluctuations in oil level.
  • A baffle should be installed in the tank between thesuction and return lines.
  • Use of flexible rubber hose piping instead of steel piping for pump suction, delivery, and drain lines provides effective vibration dampening and reduces noise.

Air bleed

• During initial system startup (and startups after long period of storage), pump may have difficulty drawing fluid. By pre-installing an air bleed valve (ABT-03) or by loosening a fitting in the delivery pipe, air can be bled from the system.
• During air bleed of pump and piping, pump should be run at no load.

Warm up

• During startup, if viscosity is higher than proper viscosity (54 mm2/s), system should be warmed up with pressure less than half of maximum working pressure until viscosity falls below 54 mm2/s.

Hydraulic fluid

• Note that pump specifications such as maximum working pressure and maximum speed may differ with the type of hydraulic fluid used. See Appendix 1 regarding hydraulic fluid selection.
• Mineral oil based fluid
  • General industrial anti-wear hydraulic fluid is recommended.
• Fire resistant fluids
  • Water glycols may be used with Tokyo Keiki standard type pumps. However maximum working pressures, maximum speeds, etc., specifications will differ from those of mineral oil based fluids.
  • Please refer to specifications of each pump for details.
  • Fluorine seals are used with pumps that operate on phosphate ester fluids. An "F3-" suffix is used to designate such pumps. Specifications for maximum working pressures, maximum speeds, etc., will differ from those of mineral oil fluids.
  • Please refer to specifications of each pump for details.
  • Please consult Tokyo Keiki regarding other fire resistant fluids.

Hydraulic fluid viscosity and temperature

• Pump should be operated with hydraulic fluid viscosity range of 13 ~ 54 mm2/s. At pump startup a maximum viscosity of 860 mm2/s is allowed however care should be paid to observe the section 'Warm Up' regarding warm up of hydraulic fluid.
• Hydraulic fluid temperature should be maintained below 65°C.