Abstract： AS 6401:2003 pdf download.Knife-gate valves for water work spurposes. 1.3.11 DN (Nominal size) An alphanumeric designation of size for components of a pipework system. which is used for reference purposes. It comprises the letters DN follow...

AS 6401:2003 pdf download.Knife-gate valves for water work spurposes.

1.3.11 DN (Nominal size)

An alphanumeric designation of size for components of a pipework system. which is used for reference purposes. It comprises the

letters DN followed by a dimensionless whole number that is indirectly related to the physical size, in millimetres. of the bore or outside diameter of the end connections.

1.3.12 Face to face dimensions

The distance between the valve mating faces measured along the valve axis.

1.3.13 Free end test

A lest here the valve ends are blanked off so that the axial hydraulic force is not externally restrained. This simulates a valve

in a terminal position held rigidly at one end only.

1.3.14 Non-rising spindle design

A valve design where the gate is attached to ihe spindle, such that as the gate moves from closed to open position the spindle does not rise during operation.

1.3.1 Rising spindle design

A valve design where the gate is fixed to the spindle such that as the gate moves from closed to open position the spindle rises

during operation.

1.3.16 Un-directional

The valve is designed to seal against the flow in one direction only

1.3.17 Type test

A once only set of tests carried out to prove performance.

1.4 VALVE TYPE

Valves shall be of the afer, flanged or lugged type for installation between flanges, or for installation at a termination point.

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