Bosch Rexroth manufactures proportional control hydraulic valves including directional control, high response control, flow control, pressure relief, pressure reducing and servo valves. The hydraulic proportional control valves are available in sizes 6 and 10 to 52 - with maximum operating pressure up to 5076 psi and maximum flow up to 180 L/min (47 gpm).

Comatrol designs proportional hydraulic control valves available with flow and pressure capabilities of 1-48 gal/min and up to 4,640 psi. Types of proportional flow control valves provided by the company include non-compensated poppet, compensated restrictive 2-way, and compensated priority 3-way.

Bucher Hydraulics is a provider of proportional directional hydraulic valves that feature maximum nominal flow rate of 180 l/min, inlet pressure of 250 bar or 350 bar, and a viscosity range of 10-380 mm2/s. These hydraulic valves are used in agricultural equipment, construction machines, material handling equipment, lifting technology, and many other applications.

Continental Hydraulics manufactures proportional control hydraulic valves that feature five pressure output control ranges from 0 to 4500 psi. Depending on model, the proportional control valves also feature nominal flow rates of .25 to 14 GPM, 6 to 25 GPM, 25 to 150 GPM, 0 to 9 GPM, and 0 to 20 GPM.

Delta Power Co. manufactures 2-way and 3-way proportional control hydraulic valves that feature maximum operating pressures of 300 psi, 500 psi, or 3000 psi. The valves are used for soft shift and flow control, speed control, or fan and motor speed control applications.

Eaton Hydraulics manufactures proportional control hydraulic valves including directional control valves, flow control valves, and pressure control valves. All of the proportional valves feature rated pressures of up to 5000 psi, and rated flows of up to 571 GPM, 185 GPM, or 106 GPM. The valves are used in die casting and foundry, machine tool, marine/offshore, press, primary metal, plastics, pulp & paper, test equipment, turbine control, and wood processing applications.

Applied Industrial Technologies distributes proportional control hydraulic valves manufactured by Vickers. The valves feature either directional or throttle control, and flow rates of 3.17 gal/min, 5.28 gal/min, 13.20 gal/min, 18.50 gal/min, 23.78 gal/min, 47.55 gal/min, 87.18 gal/min, and 99 gal/min.

Hydraforce Inc. manufactures hydraulic proportional flow control valves and proportional pressure control valves. The flow control valves are available in 2-way, 3-way, and bi-directional configurations, and feature flows of 10 GPM, 23 GPM, 20 GPM, 6 GPM, 8 GPM, 14 GPM, 15 GPM 21 GPM, 45 GPM, 17 GPM, or 40 GPM. The pressure control valves are available as relief or reducing/relieving types.

Parker Hannifin manufactures hydraulic proportional directional control valves and proportional pressure control valves. Both types of proportional valves feature response up to 300 Hz, are offered with or without on-board control electronics, and are available as standard, medium and high performance valves.

Prince Manufacturing Corporation produces a line of hydraulic flow control valves including adjustable flow control valves and proportional flow dividers. The proportional divider hydraulic valves feature maximum inlet flow capacity of 30 GPM and maximum operating pressure of 3000 psi.

ALA Industries distributes Yuken-brand proportional electro-hydraulic control valves including flow control, relief, pilot relief, pressure control, and relieving and reducing types.

Atos Electrohydraulics manufactures proportional control hydraulic valve types including pressure valves, directional valves, and flow valves. The various proportional valve types feature maximum flows ranging from 4 l/min to 600 l/min.

FEMA Corp. designs a line of electro-hydraulic proportional valves that includes direct drive valves used for flow control and pressure control. These direct-drive control valves are available as proportional types with 2, 3, 4, and 5-way control.

HAWE North America Inc. distributes 2-way and 3-way electro-proportional flow control valves used for velocity control of hydraulic actuators independent of pressure. The valves are available with an adjustable metering orifice.

Moog Components Group designs and manufactures proportional hydraulic flow control valves that feature integrated digital electronics with optional fieldbus interface; and analog interface with or without integrated electronics. The company also produces hydraulic pressure and flow control valves that feature maximum flow of 180l/min and maximum operating pressure of 350 bar.