219K

Operating principle of 219K

The manually operated shut-off member opens or closes the internal air passage. In the closed position it separates the supply side from the downstream line; the exact handle position and port orientation must be checked against the installation drawing. Reliable operation depends on clean working fluid, the moving element, seat, springs and seals. Contamination, reversed connections or an unsuitable pressure can prevent the intended response.

Role in the aircraft system

Tu-154 technical documentation places the 219K in the air line used to pressurize the hydraulic reservoirs. On the ground-service panel it protects the air bottles against leakage if downstream check valves or lines fail. The valve works with pipelines, a pressure source, downstream equipment and the control elements of its circuit. These products are functionally related but must not be described as interchangeable merely because they operate in the same system.

Installation and maintenance checks

Before installation, verify the nameplate, ports, flow direction, internal cleanliness and seal condition. Working pressure, temperature, fluid and the prescribed functional test must come from the passport and maintenance documentation. Adjustment without approved instructions is not permitted. Incoming-inspection results should remain with the product records.

Identifying 219K for ordering

Order by the exact 219K nameplate marking. Do not confuse this pneumatic shut-off valve with cabin-pressure discharge valves or with hydraulic valves carrying similar three-digit designations. Other related products are listed in the valves category. An enquiry should state the complete designation, execution, condition, delivery set and required supporting documents.