There is a spring just underneath the cylinder cover and on top of the suction valve seat. This is to prevent the liquid refrigerant to enter the compressor and causing damage, or oil entering the compressor. So when liquid is returned to the compressor, then this spring will force the VALVE SEAT to be raised preventing any damage to the head. Further, when the difference between the internal cylinder pressure and high pressure increases more than 3 Kg/cm2, this spring lifts up the VALVE SEAT.
1. High cost: Manganese bronze is a costly alloy, making it less economical for large propellers. 2. Low strength-to-weight ratio: Compared to other propeller materials like nickel-aluminum bronze or stainless steel, manganese bronze has a lower strength-to-weight ratio. 3. Susceptible to corrosion: Manganese bronze can corrode in seawater, especially when exposed to high velocities and turbulence. 4. Poor cavitation resistance: Manganese bronze is more prone to cavitation damage than other materials. 5. Difficult to cast and machine: Manganese bronze is challenging to cast and machine, making it less desirable for complex propeller geometries. 6. Limited weldability: Manganese bronze has poor weldability, making repairs and modifications difficult. Nickel-aluminum bronze or stainless steel are commonly used for propellers due to their: - High strength and durability - Excellent corrosion resistance - Good cavitation resistance - Ease of casting and machining - Weldability
Can give some pictures, not seen this any ship
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