April 9, 20197 yr I am trying to get my head around what distinguishes taps, values, stockcocks, ball valves, check valves and stop taps. The hierarchy of the Plasson catalogue indicates: All these things are either a valve or a tap. Valves=https://www.plasson.co.uk/catalogue/group/206 Taps=https://www.plasson.co.uk/catalogue/group/246/nameblock/Metal-Valves A "stop tap" is a stopcock in valve form. https://www.plasson.co.uk/catalogue/group/207/nameblock/Stop-Taps A "stop cock" is your traditional "stop cock" in tap form. https://www.plasson.co.uk/catalogue/group/246/nameblock/Metal-Valves/family/Universal%20Metal%20Stop%20Cock A check valve is a one way flow control device. https://www.plasson.co.uk/catalogue/group/246/nameblock/Metal-Valves/family/Single%20Check%20Valve%20-%20WRAS%20Approved A ball valve is a common internal implementation of a valve. https://www.plasson.co.uk/catalogue/group/210/nameblock/Ball-Valves Isolation valve shuts off flow to a single tap or device at the end of a plumbing branch. I assume valves are intended to be either open or shut unlike a tap that can in addition be set at any intermediate state of openness?
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