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Needle and check valves

Needle and check valves are the most common flow control valves. Where the needle valve restricts in both directions, there is a a parallel check valve for free flow in one direction.

How is a needle valve with reverse flow check used?

There are a variety of uses and almost always two throttle check valves are used per cylinder to be able to control the flow in both directions individually. These are fully adjustable from completely closed to completely open, and they can be turned so that it either restricts in flow (meter in) or restricts the out flow (meter out) from an actuator.

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Modell
Cavity
Nominal capacity
Flow control valve
2 ports, fully adjustable, needle valve, with reverse flow check
Manufacturer: Sun Hydraulics
T-162A
0.16" (4 mm)
T-13A
0.06" (1.5 mm)
T-13A
0.09" (2.3 mm)
T-13A
0.19" (4.8 mm)
T-5A
0.13" (3.3 mm)
T-5A
0.25" (6.4 mm)
T-16A
0.28" (7.1 mm)
T-16A
0.38" (9.7 mm)
T-18A
0.38" (9.7 mm)
T-18A
0.56" (14.2 mm)
Modell
Cavity
Nominal capacity
Flow control valve
2 ports, fixed orifice, non-compensated, with reverse flow check
Manufacturer: Sun Hydraulics
T-162A
7.5 gpm (30 lpm)
T-13A
15 gpm (60 lpm)
T-5A
30 gpm (120 lpm)
T-16A
60 gpm (240 lpm)
T-18A
120 gpm (480 lpm)
Modell
Cavity
Nominal capacity
Flow control valve
2 ports, fixed orifice, pressure compensated, with reverse flow check
Manufacturer: Sun Hydraulics
T-162A
3 gpm (11 lpm)
T-13A
6 gpm (23 lpm)
T-5A
12 gpm (45 lpm)
T-16A
25 gpm (95 lpm)
T-18A
50 gpm (200 lpm)
Modell
Cavity
Nominal capacity
Flow control valve
2 ports, fully adjustable, pressure compensated, with reverse flow check
Manufacturer: Sun Hydraulics
T-13A
0,1-6 gpm
T-13A
0,1-5 gpm
T-13A
0,1-4 gpm
T-13A
0,1-2 gpm
T-13A
0,1-1 gpm
T-5A
0,1-12 gpm
T-5A
0,1-8 gpm
T-5A
0,1-3 gpm
T-16A
0,2-25 gpm
T-16A
0,2-16 gpm
T-18A
0,2-50 gpm