SP-V-A Cupla
Noble Gases and Vacuum
The Nitto Kohki SP-V-A Cupla is a valved noble-gas and vacuum coupling for noble gases (argon, nitrogen, helium) and vacuum with an operating pressure in the pressure and vacuum range (to -0.1 MPa). For vacuum to -0.1 MPa and noble gases, valved.
As an authorised Nitto Kohki distributor we stock 32 variants of the SP-V-A Cupla - bodies in brass, stainless steel, CR, FKM, HNBR seals, model series 2P-V-A ….
| Parameter | Value |
|---|---|
| Type | valved noble-gas and vacuum coupling |
| Operating pressure | in the pressure and vacuum range (to -0.1 MPa) |
| Body materials | brass, stainless steel |
| Seals | CR, FKM, HNBR |
| Media | noble gases (argon, nitrogen, helium) and vacuum |
| Model series | 2P-V-A … |
| Variants in range | 32 |
Typical applications: shielding- and noble-gas supply, vacuum processes and distribution, analytical and laboratory technology.
Technical data from the manufacturer catalogue
| Series | SP-V CUPLA Type A |
|---|---|
| Body material | Brass (Standard material), Stainless steel (Standard material), Stainless steel (Made-to-order item) |
| Seal material | CR (Chloroprene rubber), FKM (Fluoro rubber), HNBR (Hydrogenated nitrile rubber) |
| Max working pressure | 3.0 to 7.5 MPa {31 to 76 kgf/cm2} |
| Working temperature | CR (Chloroprene rubber): -20 to +80 deg C | FKM (Fluoro rubber): -20 to +180 deg C | HNBR (Hydrogenated nitrile rubber): -20 to +120 deg C |
| Valve structure | Two-way shut-off |
| Applicable fluids | Inert gas, Vacuum, Gas, Air, Water |
| Vacuum service | 1.3x10-1 Pa {1x10-3 mmHg}: socket only operational, plug only operational, operational when connected |
| Size range | 1/4 inch to 3/4 inch |
| Catalogue page | C01en-b, 149 |
Operating principle
- Uses automatic shut-off valves with ultra-tight sealed construction in both socket and plug. Ideal for vacuum applications.
- Having automatic shut-off valves in both socket and plug facilitates easy fluid handling. Suitable for a wide range of vacuum applications as high as 1.3x10-1 Pa {1x10-3 mmHg} even when disconnected.
- Three types of seal material are available to suit any of the diversified production lines for air conditioners, refrigerators or similar.
- Can be connected with SP CUPLA Type A and SP-V CUPLA.
- Double sealing structure improves airtightness (size 1/4 inch, 3/8 inch).
- Unique straight guide stabilizes valve movement.
- Both socket and plug have unique vacuum resistant automatic shut-off valves inside. The valve prevents fluid spill out on disconnection, and also has excellent vacuum resistance even after disconnection.
- Fluid flow can be bi-directional when socket and plug are connected.
All models of the series
P-V-A - Female thread
| Model | Coupling part | Application | Brass (g) | Stainless steel (g) | L | C | T | øH(WAF) |
|---|---|---|---|---|---|---|---|---|
| 2P-V-A | Plug | R 1/4 | 37 | 32 | 36 | 22 | Rc 1/4 | Hex.17 |
| 3P-V-A | Plug | R 3/8 | 63 | 56 | 40 | 25 | Rc 3/8 | Hex.21 |
| 4P-V-A | Plug | R 1/2 | 118 | 109 | 44 | 28 | Rc 1/2 | Hex.29 |
| 6P-V-A | Plug | R 3/4 | 201 | 189 | 52 | 36 | Rc 3/4 | Hex.35 |
S-V-A - Female thread
| Model | Coupling part | Application | Brass (g) | Stainless steel (g) | L | T | øH(WAF) | øoD |
|---|---|---|---|---|---|---|---|---|
| 2S-V-A | Socket | R 1/4 | 130 | 129 | 58 | Rc 1/4 | 19 | 28 |
| 3S-V-A | Socket | R 3/8 | 202 | 192 | 65 | Rc 3/8 | 21 | 35 |
| 4S-V-A | Socket | R 1/2 | 396 | 388 | 72 | Rc 1/2 | 29 | 45 |
| 6S-V-A | Socket | R 3/4 | 680 | 644 | 88 | Rc 3/4 | 35 | 55 |
Dimensions in millimetres. Values in brackets apply in the connected condition.
Legend: L = overall length; H = width across flats or outside dimension; D = socket outside diameter; A = hose barb length; C = sleeve dimension; T = thread or barb size; B = bore
Series comparison
| Series | Max working pressure | Size range | Valve structure | Applicable fluids |
|---|---|---|---|---|
| SP-V CUPLA Type A | 3.0 to 7.5 MPa {31 to 76 kgf/cm2} | 1/4 inch to 3/4 inch | Two-way shut-off | Inert gas, Vacuum, Gas, Air, Water |
| PCV PIPE CUPLA | 45 bar | Copper pipe outside diameter 4.0 mm to 15.88 mm; end thread 1/4 inch and 3/8 inch | Valveless | Inert gas, Vacuum, Air, Gas |
Choose SP-V CUPLA Type A when the line has to be parted under vacuum or with inert gas inside: both halves carry vacuum resistant automatic shut-off valves and hold 1.3x10-1 Pa {1x10-3 mmHg} even when disconnected, whereas PCV PIPE CUPLA in the same group is valveless and leaves the line open on disconnection. Its working pressure of 3.0 to 7.5 MPa {31 to 76 kgf/cm2}, depending on body material and size, covers the 4.5 MPa {46 kgf/cm2} of that peer. Where no shut-off is required and the connection only has to pass fluid, the valveless PCV PIPE CUPLA remains the simpler choice.
Body and seal materials
| Body material |
|---|
| Brass (Standard material) |
| Stainless steel (Standard material) |
| Stainless steel (Made-to-order item) |
| Seal material | Mark | Working temperature | Remarks |
|---|---|---|---|
| CR (Chloroprene rubber) | - | -20 to +80 deg C | - |
| FKM (Fluoro rubber) | - | -20 to +180 deg C | - |
| HNBR (Hydrogenated nitrile rubber) | - | -20 to +120 deg C | - |
Further catalogue data
| Note | Value |
|---|---|
| Working pressure brass 1/4 inch and 3/8 inch | 5.0 MPa {51 kgf/cm2}, 50 bar, 725 PSI |
| Working pressure brass 1/2 inch and 3/4 inch | 3.0 MPa {31 kgf/cm2}, 30 bar, 435 PSI |
| Working pressure stainless steel 1/4 inch and 3/8 inch | 7.5 MPa {76 kgf/cm2}, 75 bar, 1090 PSI |
| Working pressure stainless steel 1/2 inch and 3/4 inch | 4.5 MPa {46 kgf/cm2}, 45 bar, 653 PSI |
| Maximum tightening torque brass 1/4 inch | 9 Nm {92 kgf cm} |
| Maximum tightening torque brass 3/8 inch | 12 Nm {122 kgf cm} |
| Maximum tightening torque brass 1/2 inch | 30 Nm {306 kgf cm} |
| Maximum tightening torque brass 3/4 inch | 50 Nm {510 kgf cm} |
| Maximum tightening torque stainless steel 1/4 inch | 14 Nm {143 kgf cm} |
| Maximum tightening torque stainless steel 3/8 inch | 22 Nm {224 kgf cm} |
| Maximum tightening torque stainless steel 1/2 inch | 60 Nm {612 kgf cm} |
| Maximum tightening torque stainless steel 3/4 inch | 90 Nm {918 kgf cm} |
| Minimum cross-sectional area 2S-V-A x 2P-V-A (mm2) | 27 |
| Minimum cross-sectional area 3S-V-A x 3P-V-A (mm2) | 51 |
| Minimum cross-sectional area 4S-V-A x 4P-V-A (mm2) | 73 |
| Minimum cross-sectional area 6S-V-A x 6P-V-A (mm2) | 178 |
| Admixture of air on connection 2S-V-A x 2P-V-A (mL) | 1.1 |
| Admixture of air on connection 3S-V-A x 3P-V-A (mL) | 2.7 |
| Admixture of air on connection 4S-V-A x 4P-V-A (mL) | 3.9 |
| Admixture of air on connection 6S-V-A x 6P-V-A (mL) | 11 |
| Volume of spillage per disconnection 2S-V-A x 2P-V-A (mL) | 0.8 |
| Volume of spillage per disconnection 3S-V-A x 3P-V-A (mL) | 2.1 |
| Volume of spillage per disconnection 4S-V-A x 4P-V-A (mL) | 3.4 |
| Volume of spillage per disconnection 6S-V-A x 6P-V-A (mL) | 9.5 |
| Flow direction | Fluid flow can be bi-directional when socket and plug are connected. |
| How to distinguish from SP CUPLA Type A | The V mark is engraved on the flat part of the plug and the flat part of the socket to distinguish from SP CUPLA Type A. |
| Seal material HNBR features | Resistant to hydrofluorocarbons (HFC-134a, HFC-407C, HFC-410A, HFC-404A), and PAG type and ester type oils. Also resistant to heat up to 120 deg C. Application: refrigerator production lines, air conditioner production lines. |
| Seal material CR features | Excellent resistance to hydrofluorocarbons (HCFC-22 and HFC-134a). Application: air conditioner production lines. |
| WAF | WAF stands for width across flats. |
| Flow rate | Flow rate - pressure loss characteristics chart printed on page 150 for 2S-V-A x 2P-V-A, 3S-V-A x 3P-V-A, 4S-V-A x 4P-V-A and 6S-V-A x 6P-V-A, flow rate axis 1 to 100 L/min. Test conditions: fluid water. |
Interchangeability and size groups
Socket and plug of different sizes cannot be connected. Interchangeable with SP CUPLA Type A, SP-V CUPLA and SP CUPLA of the same size but take heed of flow rate change.
Safety and application notes
- No grease is applied to the O-ring of the socket for HNBR seal material products when shipping. Be sure to apply refrigerating machine oil before use.
- Before use, please be sure to read the Safety Guide described at the end of this book and the Instruction Sheet that comes with the products.
All technical data on this page is taken from the Nitto Kohki general catalogue Quick Connect Couplings C01en-b, page 149. The complete catalogue is available for download on this page.
