Why is the valve stem of the straight stroke control valve relatively thin?
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It involves a simple mechanical principle - The larger the sliding friction, the lower the rolling friction. The valve stem of the straight stroke valve moves up and down, and the packing is slightly pressed tightly, which will tightly seal the valve stem and produce a large backlash. For this reason, the valve stem is designed to be very small, and the packing is also commonly used with PTFE packing