Butterfly valve, 蝶阀) Open-close part is butterfly plate, driven by the stem drive, in the Industrial Valves body around its own axis rotate 90 °, so as to achieve the aim of opening and closing or adjust. Mainly used for cutting medium in the pipeline, simple structure, flexible operation, switch quickly, small size, structure, small resistance, light weight, etc. The working principle of the butterfly valve ( Figure) Base crank type: refers to the output shaft through the crank and stem connecting way of multi-turn electric actuator ( Angle & gt; 360 degrees) - suitable for gate valve, globe valve, etc. Electric actuator output shaft rotation is more than a week, that is greater than 360 degrees, common to many talents to complete the valve opening and closing process control. Straight trip ( Linear motion) - suitable for single-seat regulating valve, two-seater regulating valve, etc. Electric actuator output shaft motion to linear motion type, not turn the way. Requests must be electric actuator based on process control control form electric actuator control switch type ( Open loop control) Switch type electric actuators common complete control open or close the valve, the valve is either in the fully open position, either in a seated position, the valve does not need accurate control medium flow stops. In particular the switch electric actuators because of the different methods of structure can be divided into fission structure and integration. Selection when necessary to clarify, otherwise often attack with control system resistance does not match the device at the scene like a, fission structure (now Often referred to as ordinary) : the control unit and separation of electric actuator, electric actuator can't separate complete control of the valve, the necessary and the control unit abilities to complete control, stop supporting common external use controller or control cabinet way. The defect of this structure is not easy to overall system device, increase the wiring and equipment costs, and easy to appear problem, when fault occurs is not easy to diagnose and repair, cost performance is not ideal, the integration of structure ( Often referred to as the overall type) : the control unit and electric actuators encapsulated into an organic whole, ideal without outside with the control unit in situ operation, remote only output relevant control information can be to stop the operation. This structure has the advantage of this system as a whole unit, reduce wiring and equipment cost, easy to diagnose and eliminate problems. But the traditional integration structure in the middle of the product also has a lot of imperfect, so the intelligent electric actuators regulate type ( Closed-loop control) Regulate type electric actuators integrated the function of the structure, not only has the switch mode can also stop the accurate control of valve, regulate a medium flow, control signal type ( Current, voltage) 。 Modulation type electric actuator control signal average current signal ( 4~20mA、0~10mA） Or voltage signal, 0 ~ 5 v, 1 ~ 5 v) , need to understand the model selection of the control signal type and parameters of the two, works ( Open type, electric type) 。 Regulate type electric actuator works for ordinary electric drive type ( In 4 ~ 20 ma's control, for example, open type refers to 4 ma signal corresponding to the valve is shut, 20 ma is corresponding to the valve open) And another for electric closed type ( In 4 ~ 20 ma's control, for example, open type refers to 4 ma signal corresponding to the valve is open, 20 ma is corresponding to the valve closed) Three signals and maintenance. Lost signal maintenance means loss of control signal, formed by the line problems of electric actuator to control the valve opening and closing to the maintenance of set value, the maintenance of common value is fully open, close, adhere to the three kinds of condition based on in situ using environment and explosion-proof grade classification of electric installation according to the using environment and explosion-proof grade request, electric valve installation can be divided into ordinary, outdoor, flameproof, outdoor flameproof etc. On the basis of the valve torque must be electric actuator output torque needed by the Industrial Valves opening and closing electric actuator torque on your choice of how much output torque, is put forward by using the ordinary or valve manufacturer to matching, as actuator manufacturers only to the actuator output torque, normal torque needed by the valve opening and closing of valve diameter size elements such as resolution, work pressure, but because of the valve manufacturer processing precision, the assembly process, so the valve manufacturer consumption with different specifications required torque is also different, even with a valve manufacturer consumption valve torque also vary with the specification, selection of actuator torque when choice is too small can form can't normal open/close the valve, and electric actuators must choose a reasonable range of torque. Correct selection of the valve electric installation: according to the operating torque moment is to choose the operating valves and electrical installation of the main parameters of electric installation output torque should be valve operating the ding torque of 1. 2 to 1. 5 times. Thrust: operating valves and electrical installation of the host structure has two kinds: one kind is not configured thrust plate, direct output torque; The other is a configuration thrust plate, the output torque after thrust plate of stem nut into output thrust. Output shaft rotation circle count: the number of laps valve electric installation output shaft rotation a few with the nominal diameter of the valve, the valve stem thread pitch, thread, according to M = H/ZS computing ( M for electric installation shall meet the total number of rotating ring, H is height of Industrial Valves opens, S for stem drive screw pitch, Z for the stem thread) 。 Stem diameter: for multi-turn rising stem valves, if pass the largest electric installation allows the valve stem diameter can't through the stem of the valve, cannot assemble into electric valve. Thus, the inner diameter of the hollow output shaft of electric installation required than rising stem valves stem diameter. Of local rotary valve and multi-turn valves non-rising stem valves, although not think stem diameter after a problem, but should also be abundant thinking when matching stem diameter and the size of the keyway, after assembly to work properly. Output speed: if the valve opening and closing speed too fast, easy to produce water hammer. Consequently, should according to different using conditions, choosing the proper opening and closing speed.
resilient gate valve double flanged gate valve processes have been widely used to produce cast iron gate valve such as os&y valve, os gate valve, and os & y valve fire protection etc.
Shenzhen Mech Valve Trading Co., Ltd.’s mission is to use our extensive ductile iron gate valve experience to deliver tangible business results enabling our clients in industry and government to profit from the advanced use of technology. We strive to build long-term client relationships based on mutual trust and respect.
Shenzhen Mech Valve Trading Co., Ltd. attach great importance to the quality of our products and R&D services.
As consumers get more and better information regarding how to compare various products and companies, it is critical to compete on the price and value of water gate valve.
Do you want to find a provider to get your wedge gate valve problem settled? If so, we suggest that you give a shot to Shenzhen Mech Valve Trading Co., Ltd.. Visit Mech Valve to learn more and contact us.