The connection flange K 43613 is an important structural and connecting component designed for the complete pilot valve K 43610 used in the automatic starting-air stop valve assembly of the Adriadiesel/Jugoturbina/Zgoda/Sulzer ZV40/48 engine. Its primary function is to provide a secure mechanical connection between the pilot valve and the corresponding components of the starting-air control system, ensuring correct positioning, alignment, and effective sealing of the associated pneumatic connections. Depending on the specific design of the valve arrangement, the connection flange may incorporate precisely machined mounting surfaces, fastening holes, sealing interfaces, and internal passages that facilitate the controlled transmission of compressed air. Accurate dimensions, suitable material strength, correct surface finish, and dimensional stability are particularly important because improper alignment, damaged sealing surfaces, or insufficient fastening can result in compressed-air leakage, mechanical stresses, or reduced pneumatic control reliability. During engine operation, the K 43613 connection flange may be exposed to repeated pressure cycles, vibration, temperature variations, and extended periods of operational readiness, requiring resistance to corrosion, deformation, and mechanical fatigue. During maintenance or overhaul, the connection flange should be inspected for cracks, corrosion, damaged mounting surfaces, worn sealing interfaces, deformation, and signs of leakage, while the associated fastening and sealing elements should also be examined. Installation and replacement should follow the manufacturer's specifications to ensure correct alignment and pressure-tight connections. By providing a stable and reliable connection for the complete pilot valve K 43610, the K 43613 connection flange contributes to accurate pneumatic control, reduced compressed-air losses, dependable operation of the automatic starting-air stop valve, and long-term operational reliability of the ZV40/48 engine.