KFRDRY02 -- Retrofit Motor for Oblique Seat Valves (Remote Control)
Product Description
The motor drive for oblique seat valves (KFR valves) enables retrofitting of existing and already installed shut-off valves into remotely controllable intelligent devices, without interrupting the water supply or cutting into the water pipe.
The motor is powered by a 12 V power supply and is fully water and dust protected (IP67) up to the power supply. Optionally, a battery pack is available for mains-independent power supply.
Various adapter rings and a sophisticated coupling system allow the motor to be used on all modern oblique seat valves from DN15 to DN32. Thanks to an additional water sensor that plugs directly into the device, the motor can be used for leak protection without any wireless connection whatsoever.
Control: Via a remote interface unit (DRYLWE02) with a robust LoRa radio link.
- Closed contact -- Valve closes
- Open contact -- Valve opens
Motor Drive Components
| Abbr. | Component | Image |
|---|---|---|
| H | Handwheel |  |
| K | Inner coupler |  |
| Ax | Adapter rings (A1--A4) |  |
| D1, D2 | Spacer rings (12 mm, 24 mm) |  |
| Ws | Ball bearing seat |  |
| M | Motor with button |  |
| G | Enclosure |  |
| N | Retaining bracket |  |
Motor Drive Assembly
Mounting on the Shut-Off Valve
- Loosen the screw in the center of the handwheel
- Remove the handwheel
- Select adapter A1--A4 (M17, M22, M27, M30)
- Place ball bearing seat W1--W3 onto the spindle (6x6, 7x7, 8x8 mm)
- Secure the ball bearing seat with a screw
- Add spacer rings D1/D2 if needed (12 or 24 mm, combinable to 26 mm)
- Place the enclosure
- Insert the inner coupler (transparent enclosure allows visual verification)
- Secure the retaining bracket around the pipe with cable ties
- Place the motor head onto the enclosure
When placing the motor head, ensure that the gears mesh correctly. If there is resistance, rotate the motor slightly.
Wilhelm Ewe GmbH Valves
Insert the split ring (E1+E2) into the 24 mm spacer ring instead of an adapter. Place the small spacer ring (DE) under the ball bearing seat for the grease chamber.
Custom Adapter
If no suitable adapter is available for the valve seat, one must be custom-fitted. Select an adapter that fits over the valve seat and fill the gap with two-component epoxy resin (included with the motor):
- Cut off a piece of the compound with a utility knife
- Knead until a uniform color is achieved
- Fill the gaps between adapter ring and valve base
- Once the resin has cured, use the now custom-fitted adapter ring
The resin will adhere firmly to the valve. If this is not desired, it helps to lightly coat the valve with oil. This makes the cured adapter ring easy to remove.
Similarly, a ball bearing seat can be custom-fitted for a valve spindle with less than 6x6 mm square. Please ensure that the spindle is fitted exactly concentrically in the ball bearing seat.
Setting the End Positions
After the motor is mounted and powered, it must determine the correct end positions for OPEN and CLOSED:
- Manually turn the valve to the OPEN position before mounting the motor for the first time. The optimal OPEN position is approximately 2 turns toward CLOSED after reaching the stop in the OPEN direction (counterclockwise).
- Supply power to the motor.
- Press the button once briefly. The motor briefly moves in both directions and detects whether it is in the OPEN or CLOSED position. The LED color indicates the detected position.
- On the first CLOSE command (via button press or control command), the motor drives to the full CLOSED stop and then turns back very slightly -- this seal relief protects the rubber seal in the valve.
The motor must be in the OPEN position when first powered on, so that automatic calibration functions correctly.
Enabling/disabling seal relief:
If the rubber seal has become brittle due to prolonged closure or aging, the slight reverse rotation may cause a leak. The function can therefore be disabled:
- Via button: Hold for 6 seconds (6x buzzer), then release
- 2x beep + 2x green LED = active (factory setting)
- 3x beep + 3x green LED = disabled
Once the end positions are detected, the motor no longer drives hard against the endpoints but counts the rotations and approaches the endpoints gently.
External Wired Water Sensor
An optional wired flood sensor can be connected to the device. There is a connector on the power cable near the motor. Remove the blue rubber plug and plug in the sensor. Please push the connector firmly to ensure a waterproof connection.
When the sensor head detects water:
- Audible alarm sounds
- Valve closes automatically
- Red LED flashes (alarm)
- Alarm message is transmitted via radio
Once the sensor head is free of water, the alarm can be cleared:
- Hold button for 2 seconds, or
- Via radio (app or control signal)
On-Device Operation
The device has a single button with a built-in tri-color LED. To toggle the valve, you can click the button or hold it for several seconds. The motor beeps every second as a counting aid.
The device is designed for outdoor use and prevents malfunctions caused by water droplets on the button. Therefore, please press the contactless button firmly, even for a short click.
Button Operation
| Action | Function |
|---|---|
| 1x click | Toggle motor (open / close) |
| Hold 2 sec | Deactivate alarm |
| 2x click | Send status report |
| 3 sec + 1 click | Enable button lock |
| 3 sec + 3 clicks | Disable button lock |
| 4 sec + 1 click | Motor stays closed after sensor alarm (factory setting) |
| 4 sec + 2 clicks | Motor reopens immediately after sensor alarm |
| 6x click | Seal relief on/off (2x beep + green = active, 3x beep + green = disabled) |
| 10 sec + 5 clicks | Full motor reset (3x beep + 3x red LED = OK) |
LED Signals
| LED | Meaning |
|---|---|
| Green slow flashing | Valve open |
| Red slow flashing | Valve closed |
| Red+green fast flashing | Motor is moving |
| Red flashing | Alarm |
| Red triple flashing | Motor is blocked |
| Yellow flashing | Searching for radio network connection |
Connecting to External Wireless Control
Control is performed via the included Dry Contact Controller (DRYLWE02). All information on usage and connection to switching contacts can be found in the DRYLWE02 manual.
Package Contents
- Motor with power cable (150 cm)
- 4x adapter rings (M17, M22, M27, M30)
- 3x ball bearing seats (6, 7, 8 mm)
- Spacer ring + split ring for Ewe valves
- Bracket + 2 cable ties
- Main enclosure + internal coupler
- 2x spacer rings (12 mm, 24 mm)
- Wired water sensor
- Dry Contact Controller (DRYLWE02)
- Power supply (150 cm)
- Replacement handwheel
- 57 g epoxy resin
- User manual
Technical Specifications
Motor Drive
| Parameter | Value |
|---|---|
| SKU | KFRDRY02 |
| Speed | 15 rpm, max. 40 s open/close |
| Power | 10.95 W |
| Gearbox | 1:704, max. 4.5 Nm |
| Noise | <50 dB |
| Adapters | M17, M22, M27, M30 |
| Valve spindle | 58--135 mm |
| Pipe diameter | DN15--DN32 |
| Weight | 380--420 g |
| Dimensions | 70 x 170--195 mm |
| Motor | ~400 mA, standby ~50 mA (12V) |
| Protection rating | IP67 (power supply IP20) |
| Operation | -20 to +60 °C |
| Storage | -30 to +70 °C |
| Minimum wall clearance | 35 mm |
| Vertical clearance required | 175 mm above pipe diameter |
| Vibration | <10 dB |
Radio Communication
| Parameter | Value |
|---|---|
| Radio Motor / Controller | LoRa P2P, SF9, EU868, >1 km |