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2-4. Air supply connection

See the user’s manual for your positioner.

• Pneumatic single-acting valve positioner (model HTP):

document No. OM2-8310-0200

• Pneumatic single-acting valve positioner (model VPE):

document No. OM2-8310-0410

• Smart valve positioner (model AVP300/301/302 (integral type)):

document No. CM2-AVP300-2001

• Smart valve positioner (model AVP200/201/202 (remote type)):

document No. CM2-AVP300-2001

• Smart valve positioner (model AVP701/702):

document No. CM2-AVP702-2001

• Smart valve positioner (with fieldbus)(model AVP703):

document No. CM2-AVP703-2001

2-5. Inspection after Installation and Precautions for Operation

Handling Precautions

•

Check the air pipe connections for leakage before use.

• Make sure that the bolts and nuts of the diaphragm case, bonnet, etc., are firmly

tightened.

• The temperature inside and outside the valve should be increased or decreased gradu-

ally (100 °C/h or less). Avoid operating the valve while the valve temperature is increas-

ing or decreasing.

• When using the valve at low temperatures, gradually lower the temperature (50°C/h or

less)

• After applying pressure to the valve, check for leakage from the valve body, gland pack-

ing, and gaskets. It is especially important, if the process fluid temperature is 400°C or

higher, to tighten the nuts further after raising the temperature of the valve. By doing so,

the valve will serve for a longer period without requiring maintenance. Use the torque

indicated in Table 5-1 to Table 5-3.

• For a valve with a lubricator, check whether the bonnet section has been lubricated or

not. To do this, loosen the lubricator handle and turn the squeeze screw. If the squeeze

screw turns lightly, replenish grease using the following procedure.

Grease replenishing procedure

(1) Obtain grease of the type indicated on the nameplate.

(2) Tightly close the lubricator handle.

(3) Remove the squeeze screw, apply grease, and set the squeeze screw.

(4) Repeat steps 2 and 3 until turning of the squeeze screw becomes heavier. Tightly close the

lubricator handle.

2-6

Azbil AGVB User Manual

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