3, on the basis of process operations depending on a parameter, choose the appropriate valve stem diameter size. 5, the handwheel on the motor mechanism of failure occurs when the stem stem system, forms can be switch to manual valve operation. 2, to reveal the upper and lower valve stroke valve position switch office location. Response speed of the actuator to restrict travel time to the satisfaction of process requirement: chooses the stem valve actuators should be a face of foot valve stroke and the technique requirements for leakage level. B, curb the valve type selection principle 1, on the basis of process conditions, choose appropriate way of structure and materials. 3, the valve spool valve core is to regulate office when the movable device, by the medium of erosion, corrosion is most serious, to seriously check repair seizing valve core is whether the local corrosion, abrasion, especially under the condition of high voltage difference things more serious abrasion of Industrial Valves core ( Because of the cavitation phenomenon) , should be pay attention to. 3, pneumatic air when the position control valve stem valve failure occurs, to maintain the valve in the air down in front of the opening position. 2, seat stem office, with medium infiltration, the fixed seat with turnbuckle appearance is susceptible to corrosion and make the seat relaxation, investigation should be pay attention. Stem valve accessories include: 1, the valve position is used to improve the office of special properties of stem valve regulation performance, successful implementation must confirm. The stand or fall of regulating valve application, in addition to product quality, the user is accurate installation, use and protection, accurate calculation, selection is very tight. Three, stem protection Industrial Valves stem valves has simple structure and reliable action and unique place, but because it is direct contact with the process medium Marine valve, its performance directly affects the system quality and pollution, so the trip over the valve stem must pass often protection and regular inspection repair, especially to use conditions and natural matter, should respect the maintenance office. Badly damaged valve core should be transform, extra should also pay attention to whether the valve stem has roughly similar phenomenon, or a petition with the valve core relaxation, etc. Q: stem valve selection principles and protection measures introduction answer: A, A, stem valve selection stem shut sex regulator valve selection is the actuator in automatic control system, its application quality direct response on system control quality. 4, diaphragm 'O' ring and other tightly closed pad. Because on the selection of calculation errors, resulting in system starting and stopping, some even have no way to putting-in-service proactively, so for the user and the system's default positions of people should be consciousness valve in the presence of the matter, be sure to switch over the section valve selection enough respect. 6, pneumatic relay movement speed of the actuator, detract from delivery time. 5, tightly closed filler ptfe packing, tightly sealed lubricant grease should be paid attention to whether ageing, whether appropriate surface damage, should change when necessary. As terminal elements in the process of stem, many of its matter than ever with the consciousness of the update. The size is determined by the volume of a cylinder, valve action time requirements and the valve of office conditions, etc. 。 Second, stem accessories in the process of producing valve, the valve stem system put forward all kinds of special requirements, because of this, stem valves must be with all kinds of accessory device ( For short attachments) To satisfied the demand of the production process. In short, the effect of the attachment is to make the function of the valve stem more complete, more reasonable, more everything. Focus on seizing part 1, the body wall for use in high pressure and corrosive medium occasion stem valves, valve body wall, diaphragm valve diaphragm often suffer from the impact of the media and corrosion, it is important to focus on seizing pressure, corrosion condition. 7, air filter to reduce pressure is used to purify air, adjust the pressure of the atmosphere. 4, the electromagnetic valve to achieve gas path of electromagnetic switch, ensure the valve when power failure the valve is in the desired degree of the whole paper. On some occasions, such as selection pressure stem valve ( Cover the vent valve) , problems to be thinking about the actual possible differential pressure suitable amplification, requiring actuators can supply larger utility strength. 5, reasonable choose actuators. 8, the gasholder safeguard when there is a failure in the air, make work without spring cylinder piston actuator can stem the action to the fail safe position. Applicants should curb the valve diaphragm, 'O' shaped tightly closed pad is aging, crack damage. 4, the requirement of technological process, needs the help of device selection. Otherwise, likely when process conditions on revealed abnormal things, stem the actual before and after the valve pressure difference is bigger, will happen dangerous don't or can't open it. 2, according to the process object's unique place, selection of stem flow valve special properties. To work under high pressure difference of valve, should also be broken to pieces by seizing whether seat tightly closed surface.
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