Breather Cap Miselli TMDF-AL – TMDFA-AL Series
The Miselli Breather Cap TMDF-AL – TMDFA-AL Series is a hydraulic filling and breather component, designed in thermoplastic material (Polyamide 66) to operate between -30°C and +100°C. It is equipped with a lobed grip for manual tightening, integrates an oil-resistant NBR O-Ring gasket (70 Shore), and a polyurethane air filter (PPI 60). The special oil splash guard below the thread protects the breather from accidental splashes during machine operation or transport. Available in standard configurations or with dipstick (TMDFA).
The Miselli Breather Cap TMDF-AL – TMDFA-AL Series represents a technical solution for filling and venting operations in hydraulic systems. The component design has been optimized to facilitate manual interaction by the operator: the grip is cylindrical and equipped with vertical lobes, a geometry specifically designed to promote and maximize grip during manual tightening phases. Visually, the main body of the cap is black, while the upper cover is red. The latter clearly displays the standard symbol for “oil filling” and the engraved wording “OIL”, ensuring quick identification of the function within the hydraulic circuit. The series is divided into two main configurations: the TMDF/AL version, which acts as a standard breather cap with splash guard and filter, and the TMDFA/AL version, which additionally integrates a dipstick for direct fluid control.
The construction of this hydraulic element is based on the use of thermoplastic materials, specifically Polyamide 66. This construction choice gives the product excellent mechanical resistance, making it suitable for operation under demanding thermal conditions. The specifications indicate guaranteed operational sealing over an extremely wide temperature range, from low temperatures of -30°C up to high heat peaks of +100°C. In addition to thermal tolerance, Polyamide 66 ensures remarkable dimensional stability over time and high impact resistance. As regards hydraulic sealing, the cap relies on an O-Ring gasket made of 70 Shore oil-resistant NBR, a material that prevents leaks and withstands prolonged contact with oils.
Atmospheric contamination control is managed by an integrated filtering element. The air filter consists of polyester-based reticulated polyurethane foam. The filtration grade is classified as PPI 60, providing a barrier against particle ingress into the tank during system venting cycles. For specific data relating to the maximum air flow rate allowed by the component, the technical specifications refer to direct contact with the technical department.
The distinctive engineering feature of this line, which differentiates it from the previous TMDF/TMDFA series, is the introduction of an oil splash guard. This protective element is positioned directly below the thread. Its primary function is to create a mechanical barrier capable of protecting the breather from the impact of occasional oil splashes. This protection is essential to maintain full component efficiency both during normal machine operation and to prevent issues caused by fluid movement during system transport.
Summary technical table of the main characteristics of the Miselli Breather Cap TMDF-AL – TMDFA-AL Series
| Feature | Value |
|---|---|
| Function | Filler and breather cap |
| Body Material | Thermoplastic (Polyamide 66) |
| Sealing Gasket | O-Ring in 70 Shore oil-resistant NBR |
| Air Filter | Polyester-based reticulated polyurethane foam (PPI 60) |
| Operating Temperatures | From -30°C to +100°C |
| Protection Feature | Oil splash guard positioned below the thread |
| Available Versions | TMDF/AL (Without dipstick) / TMDFA/AL (With integrated dipstick) |
| GAS Threads (G) | 3/8″, 1/2″, 3/4″, 1″, 1 1/4″ |
| Metric Threads (M) | 14×1.5, 16×1.5, 18×1.5, 20×1.5, 22×1.5 |