Proportional valve failures in flat vulcanizing presses can affect pressure control, machine movement, hydraulic flow, operating noise, and temperature. These symptoms may indicate problems with the valve itself or its control system, and they can interfere with the stability of the vulcanization process.
Abnormal pressure
When a proportional valve cannot regulate pressure accurately, the hydraulic pressure may fluctuate repeatedly around the setpoint. This instability can reduce product quality, for example, by causing uneven density in rubber products.
In some cases, the system cannot reach the target pressure even when the input signal is increased. Possible causes include valve blockage, wear, or an abnormal control signal.
Actual pressure may also rise well above or fall below the setpoint. Excessive pressure can damage the mold and equipment, while insufficient pressure may result in incomplete vulcanization.
Slow response
When the proportional valve responds slowly to a control signal, its spool may not move as expected. The flat vulcanizing press may then open or close more slowly, or take longer to build up pressure.
These delays can reduce production efficiency and disrupt the intended vulcanization cycle.
Irregular hydraulic flow
If the proportional valve cannot regulate flow accurately, the hydraulic oil flow entering the press may fluctuate. This can affect the speed at which the platens rise and descend, as well as the time required to build up pressure.
Insufficient flow may also cause weak or sluggish machine movements, preventing the press from completing the required vulcanization process. Possible causes include spool wear, blockage, or incorrect control parameter settings.
Unusual noise and vibration
Worn internal valve components, a sticking valve spool, or air entering the hydraulic system can cause abnormal noise and vibration during operation. The machine may also exhibit slight shaking.
These symptoms can indicate a problem with the proportional valve or the hydraulic system and warrant further inspection.
Excessive operating temperature
A proportional valve that operates for extended periods under faulty conditions may generate excessive heat due to internal leakage or friction between moving components. The valve body may become noticeably hotter than normal.
Excessive heat can shorten the service life of the valve and affect the performance of the wider hydraulic system.
Custom precision component machining services
Beyond rubber processing equipment applications, Hansheng Automation provides custom machining of precision components according to customer supplied drawings. Our services include parts for tobacco packaging and filling machinery, along with precision components for yachts and RC racing cars. We manufacture components to specified drawing dimensions and requirements for a range of mechanical applications.
