MKTV OIL SIGNAL indicators combine approximate visual flow indication with a needle valve for manual flow adjustment. This allows the operator to observe the oil and regulate it at the same piping location. The range includes standard TL, locknut TNL and copper-tube versions with different connection and length requirements.
Construction and operating specifications
| Parameter | Specification |
|---|---|
| Fluid | Oil |
| Maximum temperature | 80°C |
| Pressure resistance | 1 MPa |
| Transparent tube | Acrylic |
| Fittings | C3604 brass |
| Spring | SUS304 |
| Ball | Nylon 66; cylindrical float may be used depending on specification |
| Control valve | BC; TNL versions have a locknut |
| Threaded inlet, model table | R male thread |
| Threaded outlet, model table | Rc female thread |
| Copper-tube fittings | C3604 brass cap nuts and Cu chuck sleeve |
Approximate flow indication and adjustment
The tapered transparent passage and moving ball or float allow the approximate flow to be assessed against a reference indication. Specify the oil type or viscosity and normal flow when selecting the assembly, because the response depends on the fluid conditions. The catalog maximum-flow figure is not an accuracy specification or an electronic switch setpoint. The integrated needle valve changes the oil delivery manually while the operator observes the indicator. It does not provide automatic closed-loop regulation. TL and TNL remain separate ordering forms; the TNL locknut is used where the chosen valve setting needs to be retained.
Threaded models and dimensions
| Model | Inlet | Outlet | Length (mm) | Width (mm) | Depth (mm) | Maximum flow (L/min) |
|---|---|---|---|---|---|---|
| MKTV25-1TL | R1/8 | Rc1/8 | 94 | 25 | 51 | 3 |
| MKTV25-2TL | R1/4 | Rc1/4 | 95 | 25 | 51 | 3 |
| MKTV25-3TL | R3/8 | Rc3/8 | 99.5 | 25 | 51 | 4 |
| MKTV25-1TNL | R1/8 | Rc1/8 | 94 | 25 | 51 | 3 |
| MKTV25-2TNL | R1/4 | Rc1/4 | 95 | 25 | 51 | 3 |
| MKTV25-3TNL | R3/8 | Rc3/8 | 99.5 | 25 | 51 | 4 |
Copper-tube models and dimensions
| Model | Copper tube OD (mm) | Length (mm) | Width (mm) | Depth (mm) | Maximum flow (L/min) |
|---|---|---|---|---|---|
| MKTV25-4 | φ4 | 110 | 25 | 51 | 1.5 |
| MKTV25-6 | φ6 | 112 | 25 | 51 | 3 |
| MKTV25-8 | φ8 | 114 | 25 | 51 | 5 |
| MKTV25-10 | φ10 | 119 | 25 | 51 | 5 |
All dimensions are in millimetres. Match the complete model designation, connection type and installation length. Threaded R male and Rc female connections are distinct from copper-tube outside-diameter connections.
Alternative connection designations
| Published connection-variant example | Connection arrangement |
|---|---|
| MKTV25-3TOL | R male connections at both ends |
These are ordering examples for alternative threaded arrangements. Confirm the dimensions and availability for the requested fitting arrangement; the standard TL dimensional row must not be assumed to cover every modified connection.
Installation and operating checks
The spring-supported design allows upward, downward or sideways mounting. This flexibility concerns the mounting orientation; connect the inlet and outlet according to the intended flow path. Allow access to the adjustment valve and sight tube so the drip condition can be observed while the delivery is adjusted. Check the specified temperature and pressure limits against the actual oil circuit and verify material compatibility with the oil. Inspect the transparent tube, fittings and any seals for leakage or damage, and confirm visible oil movement after commissioning. A visual indicator supplies local information; any required automatic shutdown or remote alarm must be specified as part of the system design.
Product and dimensional illustrations
Information to provide when ordering
Specify the complete model or configured series, oil type or viscosity, normal delivery conditions, inlet and outlet connections, and available mounting space. For copper-tube models, state the tube outside diameter. For threaded models, distinguish R male from Rc female connections. Identify the TL or TNL valve form and any required locknut.