Woodward GS16 Dual Resolver with Off-Board Digital Valve Positioner Gas Metering System

The GS16DR can be mounted directly to the piping system using the 2 inch (50.8 mm) ANSI flanges.

Consideration must be given to the strength of the piping system to support the 48 kg (105 lb) weight of

the GS16DR.

The mounting interfaces of the GS16DR are designed to support only the weight of the valve itself.

Failure to properly support components (piping, valves, etc.) mounted to the GS16DR can result in

binding loads on the GS16DR body and may adversely affect valve performance.

Refer to ASME B16.5 for details of flange, gasket, and bolt types and dimensions. Verify that the piping

flange-to-flange dimensions meet the requirements of the outline drawings (Figures 1-1 and 1-2) within

standard piping tolerances. The valve should mount between the piping interfaces such that the flange

bolts can be installed with only manual pressure applied to align the flanges. Mechanical devices such as

hydraulic or mechanical jacks, pulleys, chain-falls, or similar should never be used to force the piping

system to align with the valve flanges.

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)