Grainger distributes a variety of hydraulic valves, such as relief, pressure contro and split flow valves. Hydraulic valve models include the Prince RD1850H, with a max flow 16 GPM and pressure range of 1,000 to 2,500 psi, and the Vickers CS-03-B50, with a max flow of 45 GPM and pressure range of 125 to 1,000.

Innovative Pressure Technologies specializes in high pressure hydraulic valves. Their ball valves are rated from 10,000 to 20,000 psi, while their coned and threaded valves (i.e., needle and check valves) can withstand 20,000 to 60,000 psi. The company's floating ball valves come as standard or Trunion, both of which accommodate port sizes 0.1875" to 0.5" and three mounting options. The needle valves, which are used in instrument isolation, venting, and hydraulic applications, come in six body styles and can be manufactured to meet NACE MR-01-75 and American Petroleum Institute standards. Lastly, the check valves are made in two styles: ball seat poppet (metal-to-metal seat) or soft seat poppet (O-ring seal made of nitrile or other materials); they are appropriate for fluid handling and research.

Motion Industries supplies a variety of hydraulic valves, including cartridge valves, check valves, directional control valves, flow control valves, needle valves, pressure control valves, and proportional valves. The company sells 319 unique check valves, either line mounted or manifold mounted, and manufactured by Hydac, Vickers, and others. The selection is even greater for directional control valves, which are either manual or Solenoid operated, as well as for the flow control valves, most of which are line mounted. In addition, needle valves by Hydac and manually-adjustable pressure control valves by Vickers are available, either manifold mounted or line mounted.

Sun Hydraulics has developed several standard valve packages, including a line mount, sandwich, and Solenoid operated assembly cross references, and is also capable of custom-engineering valve packages calls "valvepaks." The valvepaks are backed by Sun's screw-in hydraulic cartridge valves, and their manifolds are manufactured in either T-6061 aluminum (3,000 psi) or 65-45-12 ductile iron (5,000 psi); they can also accommodate up to 30+ individual cartridge valves. These screw-in cartridge valves are a trademark of the company; they are available in up to five sizes/capacities, and can handle flows up to 400 gallons per minute and pressures up to 5,000 psi.

Parker Hannifin manufactures hydraulic valves in three families: electrohydraulic valves, industrial valves, and mobile valves. The first family includes proportional directional control valves, proportional pressure valves, servovalves, and other electrohydraulic accessories. The industrial valve family includes ball, check, and needle valves, in addition to directional control, flow control, pressure control, and proportional valves. Available mobile valves are ball valves, check valves, directional control valves, needle valves, pressure control valves, proportional valves, and lanyard valves.

Westfield Hydraulics develops, engineers, and produces many electro-mechanical devices and fluid power assemblies. Among their offerings are thrust reverser valves, steering valves, hydraulic Solenoid valves, multi-position hydraulic Solenoid valves, and check valves. The company can also manufacture customer-designed valves and related products.

HAWE provides several types of valves in a variety of configurations. Spool valves come on/off, trotting, proportional, and/or directional, while presure valves come pressure limiting or reducing, dual stage, or load-holding. Metering valve possibilities include throttle and throttle shut-off, as well as flow controller or divider, while check valves come as standard, releasable, suction/pre-fill, or line rupture safety.

Moog offers several types of valves. Its electrohydraulic servovalves and servo-proportional valves are meant for continuous use in both industrial and aerospace applications. The company's cartridge valves, known as slip-in logic elements, are used for directional, pressure, check, and flow control, while its servocartridge valves provide directional flow control using integrated Electric Feedback Control (EFB).

Source Fluid Power carries three standard valve packages. The 25101 manifold package contains a priority-type adjustable flow divider with pressure-compensated flow that goes to the controlled port, and excess flow diverted to the bypass; it is available for all 10-2 and 16-2 cavity motorized flow controls. The 25206 manifold package contains a two-port, restrictive-type pressure compensation element, and allows flow ranges from 0-40 GPM. Meanwhile, the 25275 stackable package enables motorized flow control valves to be assembled in banks of up to eight units, providing individual, pressure-compensated flow control to each outlet.

Oilgear offers a full range of standard and special function valves, as well as custom-design flexibility. Sizes range from 0.25" to 38", while maximum pressure is 60,000 psi and flow, 26,420 GPM. A number of mounting options are available, as well: manifold, sub-plate, flange, and pipe.

STAUFF manufactures several types of hydraulic valves. The in-line mounted throttle and flow control valves are made in DV, which provides fluid control and/or shut-off in both directions, and DRV, which shuts off in one direction and allows free flow in the reverse direction; the manifold mounted throttle and flow control valves have the same options in their two models, DVP and DRVP. In addition, throttle valves (cartridge assembly), check valves (in-line mounting), and gauge isolator valves, which protect against gauge overload, are also available.

Advanced Fluid Systems carries a variety of valves, such as accumulator control valves by Bosch-Rexroth and Sun Hydraulics, ball valves by DMIC, STAUFF, and Vescor, and check valves by ATOS, Dension Hydraulics, and Snap-tite. Other valve categories offered are directional control, flow control, flow dividers/combiners, and pressure control valves.

Gulf Controls Company is an authorized distributor of hydraulic valves and other motion control products. They stock directional control, flow control, pressure control, cartridge, and other valves made by an array of manufacruters, including Bosch Rexroth, Bucher, Hydac, Hydraforce, Parker, Prince, and Sun Hydraulics.

Certified Power carries an array of hydraulic valve options from several large manufacturers. They offer directional control valves by Brand Hydraulics, Cross Manufacturing, Northman Fluid Power, Parker Gersen, Prince Manufacturing, and Yuken, as well as flow control valves by many of the same companies. Needle and check valves by RegO are also available.