ST DC Hydraulic Quick Coupling
Application
It is ideal for high pressure water and steam washing equipment, carpet cleaners, food industry, dye transfer lines & mold coolant lines.
Characteristics
The smooth , open bore with no valving in either half offers minimal pressure drop and allows easy cleaning in applications where the same lines are used for more than one media .
HL couplers and nipples are machined from solid bar stock providing the quality coupling that is durable .
HL nipples are available in brass and zinc -Plated steel . The ball locking grooves of the steel HL nipples are case hardened for resistance to brinelling where high cycle rates and pressure surges are encountered .
The HL is an ‘’Interchange’’ coupling because the dimensionally and functionally can interch-ange with simiar couplings made by other manufactures.
A broad range of metals(brass ,steel and stainless steel)and seals materials allows their use with most fluids .
The ball locking mechanism with high number of balls to distributes the work load assures low wearing and good aligne ment of the couplings .
Specifications
Materials |
Zinc- plated carbon steel body |
Seals |
standard in nitrile NBR. On request FKM&EPDM seals |
Back-up ring |
PTFE |
Working temp |
With standard seals -25°+125° |
Technical Data
HL |
ISO |
L1 |
L2 |
L3 |
D |
S1 |
S2 |
T |
COD(F) |
COD(M) |
02 |
6.3 |
52.5 |
37.3 |
34 |
24 |
20.5 |
17.5 |
1/4’’NPT |
ST-02F-NPT |
ST-02M-NPT |
03 |
10 |
55.7 |
37.5 |
40 |
28 |
25.4 |
20.6 |
3/8’’NPT |
ST-03F-NPT |
ST-03M-NPT |
04 |
12.5 |
63 |
41.3 |
44.6 |
33.5 |
28.5 |
25.4 |
1/2’’NPT |
ST-04F-NPT |
ST-04M-NPT |
06 |
20 |
78 |
53.2 |
52 |
41.5 |
38 |
30 |
3/4’’NPT |
ST-06F-NPT |
ST-06M-NPT |
08 |
25 |
83 |
53 |
59.6 |
51 |
44.5 |
38 |
1’’NPT |
ST-08F-NPT |
ST-08M-NPT |
Technical Data
HL |
ISO |
L1 |
L2 |
L3 |
D |
S1 |
S2 |
T |
COD(F) |
COD(M) |
02 |
6.3 |
63.2 |
44 |
38 |
24 |
20.5 |
14.3 |
1/4’’NPT |
ST-02F-NPT |
ST-02M-NPT |
03 |
10 |
66.2 |
44 |
44 |
28 |
25.4 |
17.5 |
3/8’’NPT |
ST-03F-NPT |
ST-03M-NPT |
04 |
12.5 |
75.3 |
49.6 |
48.6 |
33.5 |
29 |
22 |
1/2’’NPT |
ST-04F-NPT |
ST-04M-NPT |
06 |
20 |
86.5 |
56.8 |
57 |
41.5 |
38 |
27 |
3/4’’NPT |
ST-06F-NPT |
ST-06M-NPT |
08 |
25 |
95.7 |
64.3 |
61 |
51 |
44.4 |
34 |
1’’NPT |
ST-08F-NPT |
ST-08M-NPT |
Nominal Size |
Max.Working Pressure |
Rated flow |
|
HL |
ISO |
（bar） |
(l/m) |
02 |
6.3 |
370 |
6 |
03 |
10 |
370 |
12 |
04 |
12.5 |
180 |
12 |
06 |
20 |
180 |
28 |
08 |
25 |
130 |
50 |
Installation and maintenance points
Pre-installation inspection: Before connecting, ensure the dust caps of the male plug and female socket are clean and free of contaminants, and check that the seals are intact.
Correct connection: Align the male plug with the female plug and insert it until you hear a clear "click" or feel the socket fully return to its original position, indicating that the connector is fully locked.
System purging: After the initial connection, slowly operate the equipment to purge the pipeline and eliminate cavitation.
Regular maintenance: During routine equipment maintenance, check the connector for external damage, abnormal wear, or leaks. Clean the dust caps regularly.
Seal replacement: When the seals reach the end of their service life or age due to media incompatibility, the seal kit can be replaced using a special tool. This eliminates the need to replace the entire connector body, making it economical and efficient.
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