The valve will often close in 10-15 sec, but it might take few minutes to get to the established temperature. It needs to be the zone valve. Zone valves are generally set up on the return side of the hot water loop regardless of the kind of loop you’ve got. Most zone valves can be disassembled and cleaned if they aren’t opening up all of the way.
After you have turned the thermostats up to maximum then you will have to go and have a look at your zone valves. Any thermostat may be used to zone a house, but not all thermostats are for the exact same application, O’Brian notes. In addition, there are specific thermostats necessary for every type of valve.
The valves can’t be moved to return lines without lots of work. Radiator valves can at times stick. It’s also worth noting that it’s advised that a thermostatic radiator valve shouldn’t be fitted in a room with a room thermostat.
The valve could possibly be a ball valve. Valves generally have a lever which can be latched in a position to permit water to flow. Zone valves may be used in a number of applications including radiant and hydronic heating. If you’ve found that one of the valves in your boiler zone control process is faulty then you are going to want to order a replacement and find this fitted as rapidly as possible.