Automatically adjust the choice of pneumatic valve, what should comply with the requirements?

. Water engagements vent valve, appropriate USES equal percentage characteristics.
。 Water tee pneumatic valve, appropriate USES parabolic linear characteristic.
。 Steam two-way pneumatic valve, when the pressure loss ratio is greater than or equal to. , appropriate USES linear characteristic. When the pressure loss is less than. , appropriate USES equal percentage characteristics.
。 Adjust the import and export pressure difference of pneumatic valve, should be in conformity with the relevant provisions of the manufacturing plant, and to adjust the flow capacity of pneumatic valve and aperture selection calculation.