UG-176
brake reducing valve
Description
UG-176 Wheel-brake pressure-reducing valve
UG-176 is a wheel-brake pressure-reducing valve that controls aircraft wheel-brake fluid pressure in proportion to valve-stem travel commanded by the pilot control mechanism. The unit is an independent functional component of the applicable onboard system. Selection should be based on the complete designation, working medium, setting and installation diagram rather than appearance alone.
Full descriptionCollapse description
Operating principle of UG-176
Pilot input moves the valve stem and changes the regulated outlet pressure supplied to the wheel brakes. The internal feedback mechanism stabilizes the commanded pressure while the return passage permits pressure release during braking reduction. 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
Aircraft wheel-braking hydraulic system; exact aircraft and installation point must be confirmed from the braking-system diagram and illustrated parts catalogue. 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 UG-176 for ordering
Verify UG-176, stem-drive geometry, fluid specification and pressure range. The valve is a controlled brake regulator and is not interchangeable with UG-97 shuttle valves. Other related products are listed in the valves category. An enquiry should state the complete designation, execution, condition, delivery set and required supporting documents.
Technical details
- Product Type
- Wheel-brake pressure-reducing valve
- Designation
- UG-176
- Russian Designation
- УГ-176
- Function
- controls aircraft wheel-brake fluid pressure in proportion to valve-stem travel commanded by the pilot control mechanism
- Operating Principle
- Pilot input moves the valve stem and changes the regulated outlet pressure supplied to the wheel brakes. The internal feedback mechanism stabilizes the commanded pressure while the return passage permits pressure release during braking reduction.
All specificationsCollapse specifications
- System / Applicability
- Aircraft wheel-braking hydraulic system; exact aircraft and installation point must be confirmed from the braking-system diagram and illustrated parts catalogue.
- Working Medium
- AMG-10 oil to GOST 6794-75 or FH-51 / MIL-H-5606F fluid
- Operating Pressure
- Inlet 21 MPa (+1.0/−2.3); nominal drain 0.4 MPa; maximum regulated outlet 13 ±1 MPa
- Operating Temperature
- Working fluid −60 °C to +110 °C; ambient −60 °C to +85 °C
- Installation
- According to flow direction, port assignment and the diagram of the specific system
- Ordering Check
- Verify UG-176, stem-drive geometry, fluid specification and pressure range. The valve is a controlled brake regulator and is not interchangeable with UG-97 shuttle valves.
- Documentation
- Product passport, illustrated parts catalogue, system diagram and available test records
- Fluid Cleanliness
- Not coarser than class 12 to GOST 17216-2001
- Pressure-Maintaining Error
- 0.7 MPa / 7 kgf/cm² relative to the initially adjusted mean value
- Dimensions
- 143 × 46 × 34 mm
- Dry Mass
- Not more than 0.4 kg
Payment & delivery
Orders ship from our hub in Dubai. Partner stock is first transferred to Dubai, then shipped to you.
Dubai stock: 100% before dispatch. Partner stock (Remote stock) and Pre-order: 50% advance payment to start the order and 50% before shipment from Dubai to you.
Availability, lead time, delivery cost and payment terms are confirmed for your order before payment.
Payment & delivery terms