Zhejiang share nitrogen sealing pneumatic valve regulating pneumatic valve performance is the key for testing and calibration items

adjust the comprehensive performance indexes including a lot of pneumatic valve, except for some projects before installation need to check the certificate of verification and testing of the products, suggest to should focus on the following items for testing and calibration.
, to form a complete set of pneumatic valve positioner, in the process of transportation, installation, it is easy to touch touch feedback in locator plate and touch joints relax one's efforts. Therefore, before the installation, commissioning, shall be the scene debugging. Error:
, basic will ~ kPa balance increase or decrease the input signal to the input air chamber of the actuator ( Or locator) , measure each point of the tour value, calculate the: 'signal - Journey 'relationship with each point error between the theoretical value, the maximum value is the basic error. Sites should include at least the signal range, %, %, %, % this point, basic error measuring instrument should be limited to be tested 1/4 of the pneumatic valve basic error limits.
, leakage, more convenient to test medium for normal temperature water test pressure according to A test as follows: when the differential pressure of the pneumatic valve is smaller than the kPa, test pressure in kPa, when pneumatic valve working pressure difference is greater than the kPa made to allow the differential; Try and test party B according to the maximum working pressure difference of pneumatic valve. In A trial test, gas drive pressure pneumatic valve actuator signal to zero; Breath gas dynamic pressure valve actuator signal to the upper limit of the input signal; In test party B when actuator signal pressure should be design specified value. Test medium shall be in accordance with the provisions, flow into the pneumatic valve, pneumatic valve can be directly connected the atmosphere or connection export air measurement device of low pressure loss, confirm the connection on the lower reaches of pneumatic valve and pipe full after medium, in before the acquisition leakage.
, to the main pneumatic valves, should also do crush test.
, back to the poor: test method. On the same input signal and the secret of the positive and negative the biggest difference is the trip back to the poor.
, always point deviation: test methods. The signal limit ( Starting point) Is the starting point of basic error deviation; The lower limit of the signal, At the end) The basic error is the end point deviation. （ According to tests, pneumatic valve website)