Hot Water Cupla
Mold Making
The Nitto Kohki Hot Water Cupla is a hot-water quick coupling for cooling and tempering media (water, oil) with an operating pressure up to approx. 1.5 MPa. For hot water and mould tempering at high temperature (up to ~120 °C).
As an authorised Nitto Kohki distributor we stock 6 variants of the Hot Water Cupla - bodies in brass, FKM seals, model series HW-….
| Parameter | Value |
|---|---|
| Type | hot-water quick coupling |
| Operating pressure | up to approx. 1.5 MPa |
| Body materials | brass |
| Seals | FKM |
| Media | cooling and tempering media (water, oil) |
| Model series | HW-… |
| Variants in range | 6 |
Typical applications: mould cooling circuits in injection moulding, tempering of moulds and heating platens, fast mould changes.
Technical data from the manufacturer catalogue
| Series | HOT WATER CUPLA HW Type |
|---|---|
| Body material | Brass (Nickel plated) |
| Seal material | Fluoro rubber (FKM) |
| Max working pressure | 2.0 MPa {20 kgf/cm2} |
| Working temperature | Fluoro rubber (FKM): -20 °C to +180 °C |
| Valve structure | Two-way shut-off |
| Applicable fluids | Water, Steam |
| Vacuum service | Socket only: -, Plug only: -, When connected: Operational (at 1.3x10-1 Pa {1x10-3 mmHg}) |
| Size range | Plug : R 1/4, R 3/8, R 1/2 / Socket : Rc 1/4, Rc 3/8, Rc 1/2 |
| Catalogue page | C01en-b, 87 |
Operating principle
- Employs sealing material with excellent heat resistance.
- Separation prevention mechanism prevents accidental disconnection caused by vibration or impact.
- Nickel plated on the liquid contact parts to improve corrosion resistance.
- The socket has double O-ring for improved seal.
All models of the series
HW-P - Male thread
| Model | Coupling part | Application | Brass (g) | L | øD | T | ø* | øH (WAF) |
|---|---|---|---|---|---|---|---|---|
| HW-2P-M | Plug | Rc 1/4 | 41 | (44) | 18.5 | R 1/4 | 22 | Hex.17 |
| HW-3P-M | Plug | Rc 3/8 | 71 | (51) | 23 | R 3/8 | 25 | Hex.21 |
| HW-4P-M | Plug | Rc 1/2 | 149 | (62) | 30 | R 1/2 | 28 | Hex.27 |
HW-S - Female thread
| Model | Coupling part | Application | Brass (g) | L | øD | T | øH (WAF) |
|---|---|---|---|---|---|---|---|
| HW-2S-F | Socket | R 1/4 | 150 | (66) | 28 | Rc 1/4 | Hex.19 |
| HW-3S-F | Socket | R 3/8 | 247 | (74) | 35 | Rc 3/8 | Hex.24 |
| HW-4S-F | Socket | R 1/2 | 480 | (87) | 45 | Rc 1/2 | Hex.30 |
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 |
|---|---|---|---|---|
| MOLD CUPLA Series | 10 bar | Thread 1/8 inch, 1/4 inch, 3/8 inch; Hose barb for 1/4 inch and 3/8 inch hose / Braided hose o9 mm x o15 mm | One-way shut-off, Straight through | Water, Heated oil |
| HOT WATER CUPLA HW Type | 20 bar | Plug : R 1/4, R 3/8, R 1/2 / Socket : Rc 1/4, Rc 3/8, Rc 1/2 | Two-way shut-off | Water, Steam |
Pick HOT WATER CUPLA HW Type over MOLD CUPLA when the temperature control circuit carries hot water up to +180 deg C or works above 1.0 MPa {10 kgf/cm2}: the HW Type is rated for 2.0 MPa {20 kgf/cm2} and its FKM seal covers -20 deg C to +180 deg C. It is also the choice where the line has to close on both sides, since the HW Type is two-way shut-off while MOLD CUPLA shuts off on the socket side only. Where a straight through connection without a socket valve is wanted, MOLD CUPLA is the series that offers it.
Body and seal materials
| Body material |
|---|
| Brass (Nickel plated) |
| Seal material | Mark | Working temperature | Remarks |
|---|---|---|---|
| Fluoro rubber (FKM) | - | -20 °C to +180 °C | - |
Further catalogue data
| Note | Value |
|---|---|
| Pressure units printed | MPa 2.0 / kgf/cm2 20 / bar 20 / PSI 290 |
| Maximum Tightening Torque, Nm {kgf.cm} | 1/4 inch: 9 {92}, 3/8 inch: 12 {122}, 1/2 inch: 30 {306} |
| Flow Direction | Fluid flow can be bi-directional when socket and plug are connected. |
| Minimum Cross-Sectional Area (mm2) | HW-2S-F x HW-2P-M: 26, HW-3S-F x HW-3P-M: 51, HW-4S-F x HW-4P-M: 73 |
| Admixture of Air on Connection (mL) | HW-2S-F x HW-2P-M: 1.2, HW-3S-F x HW-3P-M: 2.7, HW-4S-F x HW-4P-M: 3.9. May vary depending upon the usage conditions. |
| Volume of Spillage per Disconnection (mL) | HW-2S-F x HW-2P-M: 0.8, HW-3S-F x HW-3P-M: 2.1, HW-4S-F x HW-4P-M: 3.2. May vary depending upon the usage conditions. |
| Separation prevention mechanism (Safety lock) | How to lock: slide the Lock Ring in the direction of the arrow A and rotate it simultaneously. When the Stopper is aligned with the shallower cutout on the Lock Ring, it will be in an inseparable state. How to unlock: slide the Lock Ring in the direction of the arrow A and rotate it simultaneously. When the Stopper is aligned with the deeper cutout on the Lock Ring, it will be in a separable state. |
| Approximate time for Valve replacement | At 180 deg C: please replace whole CUPLA in approximately 1000 hours. At 160 deg C: please replace whole CUPLA in approximately 3000 hours. The valve cannot be replaced. |
| Approximate time for O-ring replacement | At 180 deg C: please replace the O-rings of the Socket in approximately 700 hours. At 160 deg C: please replace the O-rings of the Socket in approximately 2000 hours. Please replace the two O-rings at once. |
| Test conditions for replacement guide | Testing device: Mold temperature controlling machine. Fluid: Clean water. Test temperature: 160 deg C, 180 deg C. Test condition: Continuous test with CUPLA connected. |
| Accessory | O-ring (2 pieces/set). Please apply grease at the replacement. |
| WAF | WAF stands for width across flats. |
| Flow rate | Flow Rate - Pressure Loss Characteristics chart is given for HW-2S-F x HW-2P-M, HW-3S-F x HW-3P-M and HW-4S-F x HW-4P-M over 1 to 100 L/min and 0.01 {0.1} to 1.0 {10} MPa {kgf/cm2}. [Test conditions] - Fluid : Water - Temperature : 23 deg C +/-5 deg C |
Interchangeability and size groups
Socket and plug of different sizes cannot be connected. SP CUPLA Type A and HW Type CUPLA of the same size can be connected regardless of end configurations. However, SP CUPLA Type A has different seal material characteristics, so the product specification and durability will differ. Conduct performance evaluation test under your actual operating environment and conditions within range of the working conditions of the product.
Safety and application notes
- On installation or removal always use correct size spanner / wrench on the hexagon section of socket/plug body.
- Hot water continuous flow test by a mold temperation controller. Valve: For continuous use of 3000 hours at 160 deg C / 1000 hours at 180 deg C. O-ring: For continuous use of 2000 hours at 160 deg C / 700 hours at 180 deg C.
- Although we have confirmed that there is no leakage, it is our experimental value and not a guaranteed value. Please consider above hours just as a guide. The durability of the seal differs depending on the customers usage conditions. Number of connection / disconnection, fluid additives, etc.
- Air will be admixed at the time of connection. Please purge the air by the equipment side when using with hot water.
- If additives are mixed in water or the piping is filled with steam, the lifetime of the seal will be decreased. When using in such an environment, conduct performance evaluation test by actual product.
- Before use, please be sure to read "Safety Guide" described at the end of this book and "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 87. The complete catalogue is available for download on this page.
