ASTM/ASME grade bolts or studs should be used to install the valve into the process piping. Flange

gasket material should conform to ASME B16.20. The user should select a gasket material which will

withstand the expected bolt loading without injurious crushing, and which is suitable for the service

conditions.

When installing the valve into the process piping, it is important to properly torque the stud/bolts in the

appropriate sequence in order to keep the flanges of the mating hardware parallel to each other. A two

step torque method is recommended. Once the studs/bolts are hand-tightened, torque the studs/bolts in

a crossing pattern to half the required torque. Once all studs/bolts have been torqued to half the

appropriate value, repeat the pattern until the rated torque value is obtained.

The inlet piping of the GS16DR valve must be in accordance with ANSI/ISA- S75.02 as required for flow

metering accuracy. Below is a figure summarizing these requirements.

Dimensions should be:

A At least 18 nominal pipe diameters of straight pipe (36.0 inch/915 mm). This may be reduced to 8

nominal pipe diameters (16 inch/407 mm) if straightening vanes are used.

B Two nominal pipe diameters of straight pipe (4.0 inch/102 mm)

C Six nominal pipe diameters of straight pipe (12.0 inch/305 mm)

D At least 1 nominal pipe diameter of straight pipe (2.0 inch/51 mm)