Mechanical Supplies
Gate Valves
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- Rising and non-rising stem gate valves for full-bore isolation on chilled water, heating and potable water lines. The wedge lifts clear of the flow path when open, so pressure drop is close to that of the bare pipe.
Application
Fitted as service isolation upstream and downstream of pumps, chillers, heat exchangers and riser branches, so a plant item can be dropped out for maintenance without draining the system. Gate valves are for fully open or fully closed duty only, throttling on a part-open wedge erodes the seat and is the usual cause of premature failure.
Standards & Reference 6 cited
EN 12266-1
Pressure testing of metallic valves: the shell and seat tests a valve passes before it leaves the factory.
EN 558
Face-to-face and centre-to-face lengths for valves in pipeline systems: the dimension that decides whether a replacement valve fits the existing gap.
EN 1092-1
Dimensions and pressure/temperature ratings for circular steel flanges, designated by PN. What makes a valve bolt up to the pipework it was specified for.
ISO 5208
Pressure testing of metallic valves, with the seat leakage rates a valve is classified against.
PN 16 / PN 25
Available in nominal pressure ratings of 16 and 25 bar, which sets both the flange drilling and the rated body pressure.
Also citedEN 1171
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