| Product Features: |
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| Applications & Markets: |
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| ISO Standard: |
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| Materials: |
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| European Pressure Equipment Directive: |
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Group 1 = Hazardous media / Group 2 = Other media
| Series | Body Size | ISO Size | Nominal Flow Diameter | Max. Operating Pressure | Rated Flow* | Air Inclusion | Fluid Loss | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Non Hazardous Liquids & Gases (Group 2) | Hazardous Liquids & Gases (Group 1) | ||||||||||
| in. | mm | mm | bar | psi | bar | psi | lpm | gpm | cc.max. | cc.max. | |
| 1HK | 1/8″ | 5mm | 4.4mm | 275 bar | 4,000 psi | 275 bar | 4,000 psi | 3 lpm | 0.8 gpm | 0.6 cc.max. | 0.5 cc.max. |
| 2HK | 1/4″ | 6.3mm | 5.9mm | 345 bar | 5,000 psi | 345 bar | 5,000 psi | 12 lpm | 3 gpm | 1.2 cc.max. | 0.9 cc.max. |
| 3HK | 3/8″ | 10mm | 7.8mm | 275 bar | 4,000 psi | 275 bar | 4,000 psi | 23 lpm | 6 gpm | 2.9 cc.max. | 2.1 cc.max. |
| 4HK | 1/2″ | 12.5mm | 10mm | 345 bar | 5,000 psi | 345 bar | 5,000 psi | 45 lpm | 12 gpm | 3.6 cc.max. | 3.5 cc.max. |
| 6HK | 3/4″ | 20mm | 17mm | 275 bar | 4,000 psi | 275 bar | 4,000 psi | 100 lpm | 26 gpm | 11.5 cc.max. | 9.3 cc.max. |
| 8HK | 1″ | 25mm | 19.6mm | 275 bar | 4,000 psi | 275 bar | 4,000 psi | 189 lpm | 50 gpm | 18.0 cc.max. | 16.9 cc.max. |
| 10HK | 1-1/4″** | – | 26.7mm | 200 bar | 2900 psi | 37 bar | 537 psi | 288 lpm | 76 gpm | 48.0 cc.max. | 48.0 cc.max. |
| 12HK | 1-1/2″ | 40mm | 35.1mm | 150 bar | 2175 psi | 29 bar | 421 psi | 375 lpm | 99 gpm | 91.3 cc.max. | 91.3 cc.max. |
| 20HK | 2-1/2″ | 50mm | 46mm | 100 bar | 1450 psi | 21 bar | 305 psi | 757 lpm | 200 gpm | 209.9 cc.max. | 209.9 cc.max. |
For questions related to vacuum please contact Danfoss.
** No ISO Standard available for the 10HK
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Socket/Female (Figure 1) |
Plugs (Male) (Figure 2) |
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| HK1-8 Series | |||||||||||||
| Part Number with Valve Actuator |
Body Size | High Impulse | ISO Size |
Type | Female Thread |
Figure | Dimensions | ||||||
| Buna-N Seal | A | B | Across Flats |
C | D | E | Hex | ||||||
| 1H11VAA | 1/8″ | No | 5mm | Socket/Female | 1/8-27 Fem. NPTF | 1 | 1.91″ (48.5mm) |
0.98″ (24.9mm) |
0.56″ (14.2mm) |
– | – | – | – |
| 1K11VAA | 1/8″ | No | 5mm | Plug/Male | 1/8-27 Fem. NPTF | 2 | – | – | – | 1.26″ (32.0mm) |
0.65″ (16.5mm) |
0.44″ (11.2mm) |
0.56″ (14.2mm) |
| 1K4VAA | 1/8″ | No | 5mm | Plug/Male | 7/16-20 Fem. SAE ORB | 2 | – | – | – | 1.41″ (35.8mm) |
0.79″ (20.1mm) |
0.59″ (15.0mm) |
0.69″ (17.5mm) |
| 2H16VAA | 1/4″ | No | 6.3mm | Socket/Female | 1/4-18 Fem. NPTF | 1 | 2.26″ (57.4mm) |
1.14″ (29.0mm) |
0.75″ (19.1mm) |
– | – | – | – |
| 2K16VAA | 1/4″ | No | 6.3mm | Plug/Male | 1/4-18 Fem. NPTF | 2 | – | – | – | 1.52″ (38.6mm) |
0.87″ (22.1mm) |
0.56″ (14.2mm) |
0.75″ (19.1mm) |
| 2K16BSVAA | 1/4″ | No | 6.3mm | Plug/Male | 1/4-19 Fem. BSPP | 2 | – | – | – | 1.52″ (38.6mm) |
0.87″ (22.1mm) |
0.56″ (14.2mm) |
0.75″ (19.1mm) |
| 3K21VAA | 3/8″ | No | 10mm | Plug/Male | 3/8-18 Fem. NPTF | 2 | – | – | – | 1.76″ (44.7mm) |
1.01″ (25.7mm) |
0.61″ (15.5mm) |
0.88″ (22.4mm) |
| 3K21CVAA | 3/8″ | Yes | 10mm | Plug/Male | 3/8-18 Fem. NPTF | 2 | – | – | – | 1.76″ (44.7mm) |
1.01″ (25.7mm) |
0.61″ (15.5mm) |
0.88″ (22.4mm) |
| 4HP26VAA | 1/2″ | No | 12.5mm | Socket/Female | 1/2-14 Fem. NPTF | 1 | 2.96″ (75.2mm) |
1.86″ (47.2mm) |
1.13″ (28.7mm) |
– | – | – | – |
| 4KP26VAA | 1/2″ | No | 12.5mm | Plug/Male | 1/2-14 Fem. NPTF | 2 | – | – | – | 2.03″ (51.6mm) |
1.30″ (33.0mm) |
0.76″ (19.3mm) |
1.13″ (28.7mm) |
| 4HP26BSVAA | 1/2″ | No | 12.5mm | Socket/Female | 1/2-14 Fem. BSPP | 1 | 2.96″ (75.2mm) |
1.86″ (47.2mm) |
1.13″ (28.7mm) |
– | – | – | – |
| 6HP31VAA | 3/4″ | No | 20mm | Socket/Female | 3/4-14 Fem. NPTF | 1 | 3.48″ (88.4mm) |
2.22″ (56.4mm) |
1.31″ (33.3mm) |
– | – | – | – |
| 6KP31VAA | 3/4″ | No | 20mm | Plug/Male | 3/4-14 Fem. NPTF | 2 | – | – | – | 2.36″ (59.9mm) |
1.52″ (38.6mm) |
0.71″ (18.0mm) |
1.31″ (33.3mm) |
| 8KP36VAA | 1″ | No | 25mm | Plug/Male | 1-11-1/2 Fem. NPTF | 2 | – | – | – | 2.85″ (72.4mm) |
1.88″ (47.8mm) |
0.97″ (24.6mm) |
1.63″ (41.4mm) |
A=Overall Length, B=Maximum Diameter
* ISO 7241-1 Series B does not include 1-1/4 inch body size couplings; therefore, Series 10HK is not covered by this standard.
To obtain connected length of coupling, add dimensions A (Fig. 1) and E (Fig. 2) together.
To obtain connected length of coupling, add dimensions A (Fig. 3) and E (Fig. 4) together.





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