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Piston type multi-function control valve


Technical performance and material requirements
(piston type multi-function control valve)

1. Summary:

Our company is a professional manufacturer of valves. The piston type multi-function control valve is a new multi-function control valve with a wide range of uses after a long market investigation and detailed analysis and demonstration of market demand. The valve has been used for nearly ten years. Multi medium, such as water, raw water (containing mud sand), sewage, sea water, steam, natural gas, oil, and so on; suitable medium temperature (transmission medium temperature: -50 ~ 135oC environment); can be widely used in water conservancy, electricity, water supply and drainage, metallurgy, chemical industry and any other industries to seek precision adjustment, safety decompression or regulation, safety. A all two - one pipe system. It can also be used as the outlet control valve at the bottom of the dam, the inlet of the turbine and the bypass control valve, the high pressure, the cutting valve under the high velocity, the front and check valves of the pump and so on. It is the final product of the mature technology. Our company is fully responsible for the safety and reliability of the valves provided, as well as the quality and performance of the valves.

Reference standard:

GB1220-1992 stainless steel rod

Definition and use of GB/T1047-2005 piping element DN (tolerance dimension)

Definition and use of GB/T1048-2005 pipe element PN (nominal pressure)

GB/T12220-1989 universal valve sign

Connection of GB/T12223-2005 partial rotary valve actuating device

Technical specification for GB/T12225-2005 general purpose valve copper alloy castings

Technical specification for GB/T12227-2005 general purpose ductile iron castings

Technical specification for GB/T12229-2005 general purpose valve carbon steel castings

GB/T13927-1992 general valve pressure test

GB/T17241.6-1998 integral cast iron pipe flange

Technical conditions for GB/T17241.7-1998 cast iron pipe flanges

JB/T106-2004 valve logo and paintJB/T5300-1991 general valve material

JB/T7928-1999 general valve supply requirements

Q/WDY15-2004 piston type multifunction control valve (enterprise standard)

Two. The main technical performance:

The basic principle and schematic diagram of the 1. piston multifunction control valve are shown below:

The valve is mainly composed of the valve body, the outlet valve body, the valve seat, the piston, the squirrel cage (fan leaf), the stem, the crank, the connecting rod, the shaft sleeve, the guide, the piston frame and the seal ring, plus the electric driving device, the PLC control system and the pressure sensor (flowmeter).

The regulation of the valve is mainly to adjust the flow area (or pressure) by changing the medium circulation area between the closed part (piston) and the seat sealing surface. The valve body is designed as an inner and outer cylinder structure, so that the structure of the valve is more in line with the flow control technology. The adjusting mechanism is a crank slider mechanism, and the closing piece is a cylinder shaped piston. In the cylinder of the valve body, the axial motion is guided by the guide guide along the center of the pipe, so the circulation area is changed to realize the control and adjustment function. The inner cavity of the valve body is a streamlined central axisymmetric flow channel, so that the fluid is well guided in the valve body, and the water resistance is small, and the head loss is low. The flow cross section at any position in the valve cavity is annular. The annular throttling surface of the piston at any position ensures the linear operation characteristics of the valve. The crank slider mechanism operates stably and reliably, the output torque is constant, the closing is fast and slow, so no water hammer is generated.

Structure design of 2. adjuster

The design of the regulating valve is generally based on the system pressure condition and the maximum and minimum flow condition. Different working conditions and technical conditions are very different. The traditional control valve is very difficult to control the output accurately in the flow regulation and pressure control, which is determined by the structure and operation mode of the traditional regulating valve. And the piston multi-function control valve can adapt to the requirements of different working conditions, and has excellent performance and good adaptability. We design the components of the valve body and close the adjusting parts to the combined split structure. When the system has different requirements, it can only meet the requirements by changing the closing regulation part or adjusting the tiny amount of adjustment. By analyzing the operating characteristics of the regulating valve, we determined that the piston type multifunction control valve was designed into two standard types: squirrel cage and fan blade ring. (as in Figure 2). When the system has special requirements, a little variation and modification can satisfy its individual requirements. At the same time, it also solves various technical problems under certain high requirements, especially in high precision, large differential pressure and large flow regulation. The piston type multi-function control valve has a pressure level up to PN100, and the upstream and downstream pressure difference of the valve can reach 4MPa.

The solution of 3. cavitation damage problem

Cavitation erosion is a problem that traditional control valve has not solved well. The two regulating structures of the piston type multifunction control valve, the squirrel cage type and the fan blade type, can effectively prevent cavitation damage (Fig. 3).

Figure 3

The fan blade ring is composed of evenly distributed guide vane, which divides the upstream medium flow into multiple small streams and conducts spiral flow under the guidance of fan blades. The flow of the medium is forced to change, and the cavitation bubbles are confined in the middle of the pipe. The rupture of the unstable bubble is not on the wall of the pipe and the valve, so it does not destroy the cavitation damage. The cage is a cylinder with holes in the front part of the piston. The hole is symmetrical, and the number of holes and quantities depends on the working conditions. The flow of medium flow through a cylindrical squirrel cage is divided into a number of high speed fluids, which is ejected into the center of the squirrel cage along the radial direction. Thus the cavitation is limited to the center of the squirrel cage, and thus the cavitation erosion of the valves and pipes will not be produced. The squirrel cage is suitable for the high pressure differential condition. When the downstream pressure is less than 2/3 of the upstream, the squirrel cage type is adopted. DN200, DN300 two caliber vane ring and squirrel cage structure pressure loss coefficient K value and valve stem opening curve (as shown in Figure 4).

Figure 4
4. operating actuator and intelligent control system

Figure 5

The general control valve mostly adopts mechanical proportional hydraulic control mode, which has the problems of slow response, low accuracy and high failure rate. We have adopted modern technology of modern industrial control, computer and network communication technology in the design of the control system of the piston type multi-function control valve, and the modern control technology is first applied to the control system of the regulating valve (such as Figure 5). At the core of the programmable controller (PLC) with multiple communication ports and analog modules, the intelligent control of the valve is realized by using various sensors to collect various state information of the system and the PLC program. Through the connection of MODEM and public telephone line, it can also realize remote technical support and service of valves. According to different needs, the operation and execution mechanism can be selected as manual, electric, hydraulic and pneumatic, convenient and flexible.

5. piston multifunction control valve in valve opening or closing process, the valve seat and seal ring do not rub each other, the valve has a long service life.

The 6. piston multifunction control valve has good sealing effect, the main sealing pair is rubber seal, and the leakage of the valve is zero.

7. piston type multi-function control valve and pipe connection form is flange connection, flange joint size according to the national standard GB/T17241.6 implementation.

The 8. piston multifunction control valve is driven by motor. The electric device is convenient, flexible, safe and reliable, and the manual operation torque is lower than the national standard. The electric device of the piston valve includes the motor, the deceleration worm wheel, the mechanical limit adjustment mechanism, the torque control mechanism, the stroke control mechanism and the opening indicator, all of the electrical components are famous brands. The working environment of common motor (ambient temperature -20 ~ 60, environment relative humidity less than 90%, field working power AC380 + 15% and control power AC220 + 15%, 50Hz + 2%) has the function of overheating protection, and the protection grade is not less than IP55.

The 9. piston valve's electric device uses Mechatronics design, configuration control box, components integrated in the enclosed actuator shell, meets the requirement of remote control and has signal output (can accept remote connection control signal, execute control command and feedback action signal), and can also carry on the operation of on-off valve and other operation in the present. It can also be operated manually. The electric equipment chooses the products of Changzhou auxiliaries general plant or other products of the same performance. (optional)

10. the casting is made by advanced casting process. It has good surface paint, and the paint is painted with paint. The color of the paint is determined by the supplier.

Three. The main components and materials of the piston type multifunction control valve are:

Serial number
Texture of material
Serial number
Texture of material
valve body
Spheroidal graphite cast iron QT450-10
Axle sleeve
Copper alloy ZCuAl10Fe3
Outlet valve body
Spheroidal graphite cast iron QT450-10
Cast steel 1Cr18Ni9
Stainless steel bar 2Cr13
connecting rod
Cast steel 1Cr18Ni9
Cast steel 1Cr18Ni9
Piston frame
Cast steel 1Cr18Ni9
Squirrel cage / fan
Cast steel 1Cr18Ni9
Copper alloy ZCuAl10Fe3
valve seat
Cast steel 1Cr18Ni9
Seal ring

Four. The main technical parameters of the piston type multifunction control valve are:

1) nominal path: DN100 to DN2000;

2) nominal pressure: PN10, PN16, PN25, PN40, PN64, PN100;

3) transportable medium: water, air, gas and steam;

4) temperature: normal -50 ~ 135oC, high temperature conditions can be designed according to user requirements. paragraph

Shaoyang Gaopin hydraulic valve Co., Ltd.

Contacts:Mr. Chen 13975998481

Company email:2323482529@qq.com

Company address:Shaoyang city double area industrial street river levee

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