Frequently asked questions

Here is a list of FAQs that support partners, resellers and installers of products in order to facilitate a speedy resolution to questions and problems.


A thermostatic valve shuts off by the liquid or wax sensor reaching temperature and expanding to push or release the pin that drives the valve close. All of BiWorld Fluid Controls thermostatic valves are fully manufactured in house and using liquid filled sensors.

A thermostatic valve is shut-off y using a cartridge or sensor that acts upon changes in temperature. A radiator valve is a control of flow into a radiator or heat emitter that is closed by a pin restricting the aperture of an inlet. When combined with a thermostatic cartridge the operation becomes automatic and it is not a manual operating valve. All of BiWorld Fluid Control thermostatic radiator valves incorporate a frost protection setting and are not a positive shut off valve, A fully positive shut off head is required and often called a decorators cap, these plastic caps screw fully onto the valve head and close the pin to stop any flow through the valve.

A lockshield valve is a manual valve that can be closed or restricted to reduce the flow into a heat emitter or radiator.

A manual radiator valve is operated manually by hand to close the valve.

When a Thermostatic radiator valve is termed reversible it can be mounted vertically or horizontally. It also can be applied to a valve when it is fitted on either the flow or return. In all cases it is suggested that a bypass valve is fitted to control the velocity and flow of water when a TRV is fitted on the return. It is advisable for TRVs to be fitted on the flow into the radiator to ensure correct heat up.

Designer valves are a modern compliment to old fashioned georgian and victorian styles. These valves are