Flow Control Valves Fixed or adjustable throttle flow valves have an effect on the flow rate depending on temperature and pressure. Check twin throttles and throttles are effective for one-way flow only. Two parallel throttle valves handle one-way flow as the flow divider valve and the opposite flow as the flow combiner valve. Flow control valve, throttle valve and flow divider valve are cartridge valves. Check throttle valves are plate type valves. With the 2-way flow control valve or the 3-way flow control valve, the load compensated flow rate can be adjusted steplessly. The 2-way flow control valve is available in combination with a check valve.