ST2C1A-A2
3/4-16 UNF • Q
max
20 l/min (5 GPM) • p
max
320 bar (4600 PSI)
1
2
1
2
ST21A-A2
ST2C1A-A2
2
1
2
1
Model Code ST21A-A2 ST2C1A-A2
Symbol
2
(58)
(232)
(290)
(116)
(174)
0
2
4
8
12 14
8
12
4
20
16
(3.1)
(1.1)
1
18 20
(4.2) (5.3)
6
10 16
(2.1)
2
(1740)
(2320)
(580)
(4060)
(4640)
(2900)
(3480)
0
4
8
12
16 20
120
160
80
280
320
200
240
(1.1) (3.2)
(4.2)
(5.3)
(2.1)
1
3
5
4
40
(1160)
26
10
14 18
ST21A-A2/L20*, ST2C1A-A2/L20*
ST2C1A-A2/L20*
Flow direction 2→1 Flow direction 1→2
Subject to change · ST2C1A-A2_5133_1en_02/2016
Page 1
www.argo-hytos.com
Needle - Restrictor Valve with Reverse Flow Check, Fine Adjustable
Technical Features
Functional Description
Technical Data
Characteristics measured at ν = 32 mm
2
/s (156 SUS)
› Reverse ow check option
› Hardened precision parts
› Fine low-torque adjustment
› Linear adjustment and positive seat overlap
› Optionally adjustable by allen key or hand screw
› Desired settings may be locked down
› In the standard version, the valve is zinc-coated for 240 h protection acc. to ISO 9227
A hydraulic ow restrictor valve in the form of a screw-in cartridge with an optional by-pass check valve.
After loosening the lock nut the valve may be unscrewed up to the red marked safety notch. Beyond the
marking, the valve may get completely unscrewed, leading to leakage.
Pressure drop related to flow rate
Valve size / Cartridge cavity 3/4-16 UNF-2A / A2
Max. flow l/min (GPM) 20 (5.3)
Max. operating pressure bar (PSI) 320 (4600)
Fluid temperature range (NBR) °C (°F) -30 ...+100 (-22 ...+212)
Mass kg (lbs) 0.2 (0.44)
Datasheet Type
General information GI_0060 Products and operating conditions
Valve bodies
In-line mounted SB_0018 SB-A2*
Sandwich mounted SB-04(06)_0028 SB-*A2*
Cavity details / Form tools SMT_0019 SMT-A2*
Spare parts SP_8010
Flow Q [l/min (GPM)]
Pressure drop ∆p [bar (PSI)]
Flow Q [l/min (GPM)]
Pressure drop ∆p [bar (PSI)]
Number of turns of the adjustment screw
1 2 3 4 5
Trottle valve closed Trottle valve opened
1 2
Check valve pressure drop related to flow rate
Model S
Model RS
27,5 (1.08)
24-30 (1.08-1.18)
12,65 (0.5)
24 (0.94)
3/ -16UNF-2A4
6
19
24
2( )8 1.10
14 0.55()
65,5 (2.58)
+Q
Q
ST2C1A - A2 / L 20 -
30+2 Nm
(22.1+1.5 ft-lbf)
ST21A
ST2C1A
A
B
S
RS
Subject to change · ST2C1A-A2_5133_1en_02/2016
Page 2
www.argo-hytos.com
Dimensions in millimeters (inches)
Ordering Code
Needle - restrictor valve, fine adjustable
Needle - restrictor valve with
reverse flow check, fine adjustable
Size
3/4-16 UNF-2A
Version
Light line
Flow rate
20 lpm (5 GPM)
Adjustment option
allen key (hex. 6), without protective cap
hand screw, metal
Surface treatment
zinc-coated (ZnCr-3), ISO 9227 (240h)
zinc-coated (ZnNi), ISO 9227 (520h)
Seals
NBR
FPM (Viton)
No designation
V
