ST21A-B2
7/8-14 UNF • Q
max
140 l/min (37 GPM) • p
max
350 bar (5100 PSI)
1
2
2
1
Model Code ST21A-B2
Symbol
80 100 120 140
(1450)
(2176)
(725)
(4351)
(5076)
(2901)
(3626)
0
20
40
100
150
50
300
350
200
250
60
(21.1) (26.4)(5.3) (15.9)(10.6) (31.7) (40.0)
8
7
4
6
2
5
3
1
80 100 120 140
(1450)
(2176)
(725)
(4351)
(5076)
(2901)
(3626)
0
20
40
100
150
50
300
350
200
250
60
(21.1) (26.4)(5.3) (15.9)(10.6) (31.7) (40.0)
8
7
4
6
2
5
3
1
Flow Q [l/min (GPM)]
Pressure drop ∆p [bar (PSI)]
Subject to change · ST21A-B2_5134_1en_02/2016
Page 1
www.argo-hytos.com
Needle - Restrictor Valve
Technical Features
Functional Description
Technical Data
Characteristics measured at ν = 32 mm
2
/s (156 SUS)
› Hardened precision parts
› Fine low-torque adjustment
› Linear adjustment and positive seat overlap
› Optionally adjustable by 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. The valve restricts ow in both directions,
making it ideal for ne control of an uncompensated system or for use as a shut-off valve.
Valve size / Cartridge cavity 7/8-14 UNF / B2
Max. flow l/min (GPM) 140 (37)
Max. operating pressure bar (PSI) 350 (5076)
Fluid temperature range (NBR) °C (°F) -30 ... +100 (-22 ... +212)
Mass kg (Ibs) 0.3 (0.66)
Datasheet Type
General information GI_0060 Products and operating conditions
Valve bodies
In-line mounted SB_0018 SB-B2*
Sandwich mounted SB-04(06)_0028 SB-*B2*
Cavity details / Form tools SMT_0019 SMT-B2*
Spare parts SP_8010
Flow Q [l/min (GPM)]
Pressure drop ∆p [bar (PSI)]
Number of half turns (180°) of the adjust. screw
1 2 3 4 5 6 7 8
Number of half turns (180°) of the adjust. screw
1 2 3 4 5 6 7 8
Flow direction 1 - 2
Flow direction 2 - 1
Pressure drop related to flow rate Pressure drop related to flow rate
Model S Model RP
ST21A-B2 / -
35+5 Nm
(25.8+3.7 ft-lbf)
14+2 Nm
(10.3+1.5 ft-lbf)
6
32 (1.26)
15,82 (0.62)
7/8-14UNF-A
26,5 (1.04)
max.85 (3.35)
21
24
68-73 (2.68-2.87)
40 (0.79)
+Q
Q
A
B
S
RP
140
H
Subject to change · ST21A-B2_5134_1en_02/2016
Page 2
www.argo-hytos.com
Dimensions in millimeters (inches)
Ordering Code
Needle - restrictor valves 7/8-14 UNF
Version
High performance
Flow rate
140 l/min (37 GPM)
Surface treatment
zinc-coated (ZnCr-3), ISO 9227 (240h)
zinc-coated (ZnNi), ISO 9227 (520h)
Seals
NBR
FPM (Viton)
No designation
V
Adjustment option
allen key (hex. 6), without protective cap
hand screw, plastic
