Check the listing for details. Sun CNAC XAN flow control valve. Condition: New. Listed at 35.00 USD. Sun CNAC XAN flow control valve. Condition is New. Shipped with USPS small flate rate. New old stock. No warranty or returns. See pictures for details. Thank you This valve is a fixed-orifice, non-pressure-compensated flow control with a reverse flow check. The flow setting is specified by the user and is set at the factory. Customer must specify the orifice diameter. These are essentially check valves with bypass orifices. The flow path matches Sun's flow controls and can be used in any flow control manifolds. Valves with the opposite direction of flow can be found under check valves with bypass orifices. Because these valves are non-compensating devices, the fixed orifice size will regulate flow through the valve in proportion to the square root of the pressure differential across ports 1 and 2. All 2-port flow control cartridges are physically and functionally interchangeable (i.e. same flow path, same cavity for a given frame size). However, cartridge extension dimensions from the mounting surface may vary. The customer specified orifice diameter is stamped on one of the cartridge's hex faces. Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge machining variations.