Zero Spill Cupla
Medium Pressure up to 75 Bar
The Nitto Kohki Zero Spill Cupla covers quick-release couplings that prevent any fluid release during disconnection and are rated for medium pressures up to 75 bar. The extensive range divides into single couplings of the ZEL series (brass, FKM/NBR) and Multi Cupla Zerospill (MAM-A/MAM-B) in brass or aluminium. MAM-A and MAM-B allow simultaneous connection of two to four lines, with sizes 2S to 4P, direct hose connections (6-12 mm), and FKM or NBR seals available.
The ZEL single couplings are available in brass with FKM seals for nominal sizes 2P to 4P and 2S to 4S. The spill-free function prevents fluid loss during coupling and uncoupling, which is especially relevant for environmentally sensitive media or costly fluids.
| Series | Connections | Material | Seal | Connection type |
|---|---|---|---|---|
| ZEL-2P/S to 4P/S | Single coupling | Brass | FKM | G thread |
| MAM-A-ZEL-2S to 4P | Single zero spill | Brass | FKM | G thread |
| MAM-A-2S6-CL to 4S12-CL | 2-4 lines | Aluminium | NBR | Hose 6/8/12 mm |
| MAM-A-2P6-CL to 4P8-CL | 2-4 lines | Aluminium | - | Hose 6/8 mm |
| MAM-B-2S6-CL / 2P6-CL | 2 lines | Aluminium | - | Hose 6/8 mm |
Typical applications: Hydraulic systems with environmentally sensitive or costly media, line connections in the chemical and pharmaceutical industries, coolant connections in machine tools, multi-coupling applications on construction equipment attachments, and quick-change systems on test rigs where fluid loss during coupling must be excluded.
Technical data from the manufacturer catalogue
| Series | ZEROSPILL CUPLA |
|---|---|
| Body material | Brass, Stainless steel (SUS 304) |
| Seal material | Nitrile rubber (NBR), Fluoro rubber (FKM), Ethylene-propylene rubber (EPDM) |
| Max working pressure | 3.5 MPa {35 kgf/cm2} |
| Working temperature | Nitrile rubber (NBR): -20 to +80 deg C | Fluoro rubber (FKM): -20 to +180 deg C | Ethylene-propylene rubber (EPDM): -40 to +150 deg C |
| Valve structure | Two-way shut-off (Spill Reduction) |
| Applicable fluids | Water, Hydraulic oil, Chemicals, Air, Gas |
| Vacuum service | Operational when connected, at 1.3x10-1 Pa {1x10-3 mmHg}. Not applicable for socket only or plug only. |
| Size range | 1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, 1 inch (thread) |
| Catalogue page | C01en-b, 89 |
Operating principle
- Unique seal design reduces both liquid spillage and air ingress.
- New valve design offers smooth zero-friction movement, resulting in reduced chance of malfunction caused by deterioration of valve parts.
- Push to connect design: just push the plug into the socket for simple and secure connection, which reduces connection time and improves efficiency.
- One-hand easy operation.
- A variety of body materials and sizes have been standardized to support a wide range of applications and situations.
- Automatic shut-off valves in both socket and plug prevent fluid spill out on disconnection.
- Volume of spillage about 96 percent less compared with SP CUPLA Type A.
- Volume of air ingress about 94 percent less compared with SP CUPLA Type A.
All models of the series
ZEL-P - Female thread
| Model | Coupling part | Application | Brass (g) | Stainless steel (g) | L | C | T | øH (WAF) | øoD |
|---|---|---|---|---|---|---|---|---|---|
| ZEL-2P | Plug | R 1/4 | 34 | 32 | 39 | 26.1 | Rc 1/4 | Hex.17 | 19 |
| ZEL-3P | Plug | R 3/8 | 67 | 63 | 44.5 | 32 | Rc 3/8 | Hex.23 | 25 |
| ZEL-4P | Plug | R 1/2 | 117 | 109 | 52.5 | 36.8 | Rc 1/2 | Hex.29 | 32 |
| ZEL-6P | Plug | R 3/4 | 264 | 248 | 68.5 | 48 | Rc 3/4 | Hex.36 | 39.5 |
| ZEL-8P | Plug | R1 | 359 | 339 | 76.5 | 56 | Rc 1 | Hex.42 | 46 |
ZEL-S - Female thread
| Model | Coupling part | Application | Brass (g) | Stainless steel (g) | L | T | øH (WAF) | øoD |
|---|---|---|---|---|---|---|---|---|
| ZEL-2S | Socket | R 1/4 | 133 | 125 | (56) | Rc 1/4 | Hex.21 | 28 |
| ZEL-3S | Socket | R 3/8 | 255 | 239 | (66) | Rc 3/8 | Hex.27 | 35 |
| ZEL-4S | Socket | R 1/2 | 404 | 382 | (76) | Rc 1/2 | Hex.32 | 42 |
| ZEL-6S | Socket | R 3/4 | 829 | 784 | (95.5) | Rc 3/4 | Hex.42 | 55 |
| ZEL-8S | Socket | R1 | 1406 | 1326 | (114.5) | Rc 1 | Hex.50 | 65 |
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 |
|---|---|---|---|---|
| TSP CUPLA Socket with Ball Valve | 10 bar | 1/4 inch to 1 inch | One-way shut-off | Water, Hydraulic oil, Air, Gas |
| ZEROSPILL CUPLA | 36 bar | 1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, 1 inch (thread) | Two-way shut-off (Spill Reduction) | Water, Hydraulic oil, Chemicals, Air, Gas |
| SP CUPLA Type A | 75 bar | 1/8 inch to 2 inch | Two-way shut-off | Water, Hydraulic oil, Chemicals, Air, Gas, Steam |
| TSP CUPLA | 75 bar | 1/8 inch to 2 inch (thread and hose) | Straight through | Water, Hydraulic oil, Chemicals, Air, Gas, Steam |
Pick ZEROSPILL CUPLA when disconnection must not spill: it shuts off on both sides with spill reduction, and the catalogue figures put its spillage about 96 percent and its air ingress about 94 percent below SP CUPLA Type A, the two-way shut-off sibling in the same category. Its working pressure stops at 3.5 MPa {35 kgf/cm2}, so lines that go up to the 7.5 MPa {76 kgf/cm2} of TSP CUPLA or SP CUPLA Type A are outside its range. TSP CUPLA is straight through and TSP CUPLA Socket with Ball Valve shuts off on one side only at 1.0 MPa {10 kgf/cm2}, so neither of them holds the fluid back in both halves the way this series does.
Body and seal materials
| Body material |
|---|
| Brass |
| Stainless steel (SUS 304) |
| Seal material | Mark | Working temperature | Remarks |
|---|---|---|---|
| Nitrile rubber (NBR) | - | -20 to +80 deg C | Standard material |
| Fluoro rubber (FKM) | - | -20 to +180 deg C | Standard material |
| Ethylene-propylene rubber (EPDM) | - | -40 to +150 deg C | Standard material |
Further catalogue data
| Note | Value |
|---|---|
| Pressure unit conversion | Working pressure 3.5 MPa / 36 kgf/cm2 / 36 bar / 508 PSI |
| Maximum tightening torque, brass, N m {kgf cm} | 1/4 inch: 9 {92}; 3/8 inch: 12 {122}; 1/2 inch: 30 {306}; 3/4 inch: 50 {510}; 1 inch: 65 {663} |
| Maximum tightening torque, stainless steel, N m {kgf cm} | 1/4 inch: 14 {143}; 3/8 inch: 22 {224}; 1/2 inch: 60 {612}; 3/4 inch: 90 {918}; 1 inch: 120 {1224} |
| Flow direction | Fluid flow can be bi-directional when socket and plug are connected. |
| Minimum cross-sectional area (mm2) | ZEL-2SP: 31; ZEL-3SP: 60.5; ZEL-4SP: 86.5; ZEL-6SP: 160.6; ZEL-8SP: 188.7 |
| Admixture of air on connection (mL) | ZEL-2SP: 0.16; ZEL-3SP: 0.21; ZEL-4SP: 0.37; ZEL-6SP: 1.12; ZEL-8SP: 1.52. May vary depending upon the usage conditions. |
| Volume of spillage per disconnection (mL) | ZEL-2SP: 0.06; ZEL-3SP: 0.12; ZEL-4SP: 0.20; ZEL-6SP: 0.43; ZEL-8SP: 0.55. May vary depending upon the usage conditions. |
| Accessory | CUPLA ADAPTER for Braided Hose Connection. Can be screwed into CUPLA with female threads, 3/8 inch, 1/2 inch, 3/4 inch. See page 166 for the details. |
| WAF | WAF stands for width across flats. |
| Flow rate | Flow rate - pressure loss characteristics are given as a graph on page 90. Test conditions: fluid water, temperature 23 deg C +/- 5 deg C. Curves are plotted for ZEL-2SxZEL-2P, ZEL-3SxZEL-3P, ZEL-4SxZEL-4P, ZEL-6SxZEL-6P and ZEL-8SxZEL-8P over a flow rate range of 1 to 1000 L/min and a pressure loss range of 0.01 {0.1} to 1.0 {10} MPa {kgf/cm2}. |
Interchangeability and size groups
Socket and plug of different sizes cannot be connected.
Safety and application notes
- 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 89. The complete catalogue is available for download on this page.
