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Precautions
A. Piping
1. When piping, please use I.D. equivalent to or larger than NPT size on the Namur valve.
2. Before piping, flush the system to remove dust, scale, chips, seal tape, etc. in the pipe line both on the supply side (supply pressure port side) and secondary side (operation equipment port side).
3. For three-position closed center, perfect check valve, check for leakage from piping and fittings in-between valve and cylinder by means of soapy water to ensure that there is no leakage. Also, check the leakage from cylinder rod seal and piston seal. If there is any leakage, the cylinder (when the valve is de-energized) may move without stopping at mid-position. Therefore, leakage from piping and fittings should be completely removed. When applying teflon sealing tape to the thread area, wind it around the thread area 1-2 times while ensuring the thread extends one or two screw pitches beyond the taped area. Also, when applying liquid seal materials, leave 1-2 threads from the end, and avoid over-application. Never apply to the female side of the equipment.
Taking safety into consideration, the piping system should always be mounted so that disassembling and assembling can be carried out easily.

B. Mounting
1. Single acting valves can be mounted in any direction. Never use in a vibration condition of more than 5G.

C. Wiring
1. For DIN connector and terminal block (with indicator light/surge voltage suppressor), the interior wiring is shown below. Please connect with respective power terminals

D. Environmental Conditions
1. When valve is installed in a dusty area, protect cylinder rod to prevent dust from entering secondary piping from rod end. Install to prevent dust from entering secondary piping from rod area. Install silencer or elbow fitting with its outlet pointed downwards to prevent dust from entering the exhaust port of the valve.
2. When used in environmental conditions where corrosive gas, chemical solutions, steam, seawater or high temperatures higher than 140°F exist, contact DEI.
Note: Filtration and speed control devices are available from DEI.

E. Lubrication
1. Valves are pre-lubricated (no further lubrication is necessary).
2. If a lubricant is used (if required for cylinder, etc.), install lubrication (oiler) on the supply side piping.
a. The recommended lubricant is turbine oil #1 (ISO VG32).
b. Never use spindle oil or machine oil.
c. When valve is used at low temperature, low temperature oil should be used.
d. The use of turbine oil at temperatures lower than 32°F leads to increased viscosity and may cause the valve to malfunction.

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