Instruction manual

Instruction Manual

D500248X012

A31D Valve

April 2014

Table 4. Valve Weights

SIZE CL150 CL300

NPS kg lb kg lb

3 15 33 28 63

4 25 56 35 77

6 34 76 65 143

8 54 118 156 343

10 81 178 176 388

12 110 243 294 649

14 152 335 345 760

16 201 443 563 1240

18 243 535 591 1303

20 277 611 706 1556

24 434 956 1307 2881

An A31D valve is normally shipped as part of an assembly with an actuator and other accessories such as a valve

positioner. If the valve and actuator have been purchased separately or if the actuator has been removed for

maintenance, properly mount the actuator and adjust valve/actuator travel and all travel stops before inserting the

valve into the line.

CAUTION

Damage to the disk will occur if any pipe flanges or piping connected to the valve interfere with the disk rotation path. Be

certain to align the valve accurately to avoid contact between the disk (key 2) and the flanges.

Adjusting the Actuator Travel Stops or Travel

Key number locations are shown in figure 9, 10, or 11, unless otherwise noted.

1. Refer to the actuator instruction manual to locate the actuator travel stop that controls the closed position of the

valve disk (key 2). When adjusting the travel stop or travel, make sure that the disk is from 0.25 to 0.76 mm (0.010

to0.030inch)awayfromtheinternalstopinthevalvebody(seefigure5).Thisadjustmentisnecessarytobe

certain that the actuator output torque is fully absorbed by the actuator travel stop or by the actuator. The internal

travel stop in the valve body should not absorb any of the actuator torque.

CAUTION

When using an actuator, the actuator travel stop (or actuator travel, for actuators without adjustable stops) must be

adjusted so the disk stop in the valve does not absorb the output of the actuator. Failure to limit the actuator travel as

described in the Adjusting the Actuator Travel Stops or Travel steps can result in damage to the valve, shaft(s), or other

valve components.

2. Before installing the valve/actuator assembly in the process line, cycle the valve several times to be sure the valve

disk returns to the proper position.

Installing the Valve

The maximum allowable inlet pressures for A31D valves are consistent with the applicable ASME

pressure/temperature ratings except where limited by the material capabilities.