1 1 test conditions and specification. 1 reference to working conditions in addition to the appearance inspection and otherwise stipulated in clause test shall be carried out under the condition of the following reference. a) Temperature: 20 ℃ plus or minus 2 ℃; b) Relative humidity: 60% ~ 70%; c) The atmospheric pressure: 86 kPa to 106 kPa. d) Air pressure: rating, tolerance is plus or minus 1%. 1. 2 recommended atmospheric conditions need not or can't be in the reference work under the condition of experiment, recommended under the following atmospheric conditions; a) Temperature: 15 ℃ ~ 35 ℃; b) Relative humidity: 45% ~ 75%; c) The atmospheric pressure: 86 kPa to 106 kPa. In the process of test, the change of environmental temperature should be not more than 1 ℃ every 10 min, and should be indicated in the test report the actual test conditions. Stuffing box, and other joint 2 for tightness in 1. 1 times the nominal pressure of room temperature water, the water can contain water soluble oil or rust inhibitor, in accordance with the provisions, the entrance to the direction of the input control Industrial Valves body, the other end closed, at the same time make the stem for 1 ~ 3 times per minute reciprocating motion, the duration of not less than 3 min. Observe the regulator stuffing box, and other joints have no leakage phenomenon. After test should be empty, if necessary, shall be clean and dry. 3 chamber sealing design prescribed by the rated pressure air into the seal chamber, cut off the gas source, observed within 5 min film gas indoor or cylinder each indoor gas pressure reducing value. For no inner leakage possible actuator chamber, in the chamber of the seal coated with soap and water, check for leakage, for small specifications of the actuator can also be immersed directly in the water, check for leakage. Four basic error will be stipulated by the input signal direction smoothly according to increase or decrease input actuator air chamber ( Or locator) , measuring each point of the journey value, and according to the formula ( 1) - to calculate the real 'signal - - - - - - Trip 'relationship with the theory of relationship between each point error and the maximum value is the basic error. δi=［( li- Li) / L)×100%。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 ( 1) Type: in the delta I - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - The ith point error; li- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - The point of actual schedule I; Li- - - - - - - - - - - The ith point theory of stroke; L - - - - - - - - - - - Rating of the Industrial Valves stroke. Unless otherwise specified, the test should include at least the signal range of 0, 25%, 50%, 75%, 100%, five points. Basic error measuring instrument shall not exceed limited participants regulator 1/4 basic error. 5 return difference test procedure is the same as 4, on the same input signal is measured by the positive and negative of the absolute value of difference is the biggest difference back. 6 dead zone a) Slow change ( Increase/decrease) Input signal, until to detect a perceptible schedule change, write down at this time of the input signal value; b) Slowly changing according to the opposite direction ( Decrease or increase) Input signal, until to detect a perceptible schedule change, write down at this time of the input signal value; c) The above a) ,b) The absolute value of the difference between the two values of the input signal for dead zone, namely dead zones should be in the input signal range test were 25%, 50% and 75% at 3 o 'clock. 7 will always point deviation input signal upper and lower limit value added actuator air chamber ( Or locator) , the acquisition of the corresponding travel value, according to the formula ( 1) Always point deviation calculation. 8 rated travel deviation will join the actuator input signal chamber ( Or locator) To make the Industrial Valves stem walk all the way, according to the formula ( 1) Calculate the rated travel deviation.
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