trv4 lockshield
i bought a Drayton TRV4 + lockshield set, and found the lockshield is
pretty much the same valve body as the TRV but with a plastic head that acts as a manual valve, operating the valve plunger as you turn it. This surprised me - shouldn't the lockshield be set using a tool, with a cap that doesn't operate the valve? This one seems to make it too easy for someone to open/close the valve and unbalance the system. I think I'll go and buy a more usual lockshield to use instead. |
trv4 lockshield
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