Breather Cap Miselli TMDV – TMDAV Series
The Miselli Breather Cap TMDV – TMDAV Series is designed for one-way venting in hydraulic systems. Made of high-mechanical-resistance thermoplastic material (-30°C to +100°C), it integrates a valve calibrated at 0.30 bar that prevents external contamination and fluid leakage. Equipped with an oil-resistant rubber O-Ring, it ensures excellent sealing. The TMDAV variant includes a steel level dipstick. Ideal for compressors, reducers, and multipliers.
The Miselli Breather Cap TMDV – TMDAV Series is an essential component for the proper management and control of fluid contamination in pressurized hydraulic systems. This filler and breather cap is specifically developed for applications requiring one-way air discharge in the presence of internal overpressure.
The component design includes a cylindrical head with vertical lobes, an engineered geometry designed to facilitate and simplify manual tightening operations by operators. From a visual and functional standpoint, the entire series is supplied with a black body and a red cover printed with the “valve” graphic symbol, ensuring quick identification of the component function within the system.
The reliability of the Miselli Breather Cap TMDV – TMDAV Series comes from the use of high-quality materials. The body is made of an advanced thermoplastic material that gives the component excellent mechanical resistance, high dimensional stability, and remarkable impact resistance. These structural characteristics allow the cap to operate continuously and safely over a wide temperature range, covering a thermal interval from -30°C to +100°C.
To ensure maximum hydraulic sealing and prevent leakage, the cap is supplied as standard with an O-Ring gasket made of oil-resistant synthetic rubber with 70 Shore hardness. This material choice ensures compatibility and durability with common hydraulic fluids.
The functional core of these caps lies in the integrated one-way check valve. This valve, whose action is mechanically regulated by a spring, is calibrated as standard at approximately 0.30 bar. Its operation allows outgoing air to vent during work cycles that generate pressure, while at the same time hermetically blocking the system in the opposite direction. In this way, the ingress of impurities, dust, or contaminants into the tank is categorically prevented and, at the same time, oil splashes are prevented from escaping into the external environment. The optimal performance of this valve depends on the specific working conditions, as well as the type and quantity of oil used in the system. For different system requirements, an alternative valve with a spring calibrated at approximately 0.10 bar is available upon request.
While the TMDV series performs breather and closing functions, the TMDAV series adds fluid monitoring functionality. The TMDAV model is supplied with an integrated level dipstick made of grey phosphated steel. The dipstick has a round section with a diameter ranging from 4 to 5 mm, depending on the specific model selected, and is supplied with a standard length of 200 mm. For specific measuring requirements, and for minimum order quantities of 250 pieces, the manufacturer offers the option of supplying dipsticks with customized lengths and engraved marks for checking minimum and maximum fluid levels.
Installation flexibility is ensured by a wide range of available threads, ranging from Gas versions (from G3/8″ to G1 1/4″) to Metric versions (from M14x1.5 up to M22x1.5), allowing adaptation to any block or tank. Thanks to its safety and sealing specifications, this component is strongly recommended for installation on industrial machinery operating in demanding contexts, with particular reference to applications on compressors, speed reducers, multipliers, and transmission components in general.
Summary technical table of the main characteristics of the Miselli Breather Cap TMDV – TMDAV Series
| Feature | Value |
|---|---|
| Body Material | Thermoplastic (dimensional stability, impact resistance) |
| Operating Temperatures | From -30°C to +100°C |
| Sealing Gasket | O-Ring in 70 Shore oil-resistant synthetic rubber |
| Valve Type | One-way check valve (outgoing air vent) |
| Standard Valve Calibration | Approx. 0.30 bar (spring) |
| Optional Valve Calibration | Approx. 0.10 bar |
| Standard Color | Black body, red cover with valve graphic symbol |
| Level Dipstick (TMDAV Series only) | Grey phosphated steel, round section (Ø 4-5 mm), L = 200 mm standard |
| Recommended Applications | Compressors, reducers, multipliers, transmission components |
| Available Threads | Gas (G3/8″ – G1 1/4″) / Metric (M14x1.5 – M22x1.5) |