Flow control valve400X flow control valveIt is a multi-function valve that uses high-precision pilot mode to control flow.It is applicable to the pipeline where the flow and pressure of the distribution pipe need to be controlled. Keep the predetermined flow constant, limit the excessive flow to a predetermined value, and reduce the upstream high pressure appropriately. Even if the pressure upstream of the main valve changes, the flow downstream of the main valve will not be affected.The connection mode is divided into flange type and thread type;Welded.The control and adjustment modes are divided into automatic and manual.
Chinese name
Flow control valve
Foreign name
flow control valve
Formal classification
Throttle valve, speed control valve, overflow throttle valve
SG-ZZ-2 Mechanical Scale Display Manual Flow Control Valve
The flow control valve controls the flow of the orifice by changing the size of the hydraulic resistance of the orifice under a certain pressure difference, so as to adjust the actuator (hydraulic cylinder orHydraulic motor）Valve type of motion speed.Mainly includingthrottle valve、Governor valve、overflow throttle valve andDiverter and collector valveEtc.The installation mode is horizontal installation.The connection mode is divided into flange type and thread type;Welded.The control and adjustment modes are divided into automatic and manual.
model selection
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It can be selected according to the pipe diameter, the maximum flow and the flow range of the valve.
Flow control valve400X flow control valveIt is a multi-function valve that uses high-precision pilot mode to control flow.It is applicable to the pipeline where the flow and pressure of the distribution pipe need to be controlled. Keep the predetermined flow constant, limit the excessive flow to a predetermined value, and reduce the upstream high pressure appropriately. Even if the pressure upstream of the main valve changes, the flow downstream of the main valve will not be affected.
classification
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Flow control valve
The flow control valve mainly includes throttle valve, speed control valve, overflow throttle valve, diversion and collection valve, etc.This valve is generally installed horizontally.
Flow control valve, also known as 400X flow control valve, is a multi-function valve that uses high-precision pilot mode to control flow.
1. First, the principle of reducing the drainage area by using orifices or pure machinery for conventional throttle valves is changed, and relevant pilot valves are used to minimize the loss of energy in the throttling process
2. High control sensitivity, safety and reliability, simple debugging and long service life.
The flow control valve can automatically realize the flow balance of the system without external power supply.The flow is limited by keeping the pressure difference between the front and rear of the orifice plate (fixed hole diameter) constant. Therefore, it can also be calledFlow valve。
setFlow valveThe object of action is flow, which can lock the amount of water flowing through the valve, rather than the balance of resistance.It can solve the dynamic imbalance problem of the system:refrigerator, boilerCooling towerThe efficient operation of heat exchanger and other equipment requires that the flow of these equipment be controlled to be fixed at the rated value;From the end of the system, in order to avoid the interaction of dynamic regulation, it is also necessary to limit the flow at the end device or branch.
The problems that should be paid attention to in the design,Flow control valveThe disadvantage is that the valve has the requirement of minimum working pressure difference. Generally, the minimum working pressure difference of the product is 20KPa. If it is installed on the most unfavorable circuit, it must bewater circulating pumpIncrease the working lift of 2m water column, so the method of installing near end and disturbing far end shall be adopted.When the distance from the user to the heat source is more than 80% of the heating radius, do not install this flow control valve.
model selection
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It can be selected according to the pipe diameter.
It can be selected according to the maximum flow and the flow range of the valve.
Digital displayFlow control valveThe structure is composed of automatic valve core, manual valve core and display part.The display part consists of flow valve movement, sensor transmitterElectronic calculatorDisplay part composition.
Its work is extremely complex.The measured water flows through the valve, and the water flows into the impeller in the flow movement. The impeller rotates and senses the sensor transmitter, making the sensor send an electrical signal proportional to the flow. The flow electrical signal is sent to the electronic calculator through the wire, and the flow value is displayed after the calculator calculates and the microprocessor processes it.
The manual valve element is used to adjust the flow, and set the required flow value according to the displayed value.The automatic valve core is used to keep the flow constant, that is, when the pressure of the pipe network changes, the automatic valve core will automatically open the large valve port and close the small valve port under the effect of the pressure to maintain the set flow value unchanged.
technical requirement
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1 Pressure temperature class
The pressure temperature class of the flow control valve is determined by the pressure temperature class of the shell, internals and control pipe system materials.The maximum allowable working pressure of the flow control valve at a certain temperature is the smaller value of the maximum allowable working pressure of the shell, internals and control pipe system materials at that temperature.
1.1 The pressure temperature class of the iron shell shall comply with the provisions of GB/T17241.7.
1.2 The pressure temperature class of steel shell shall comply with the provisions of GB/T9124.
1.3 For materials without pressure temperature class specified in GB/T17241.7 and GB/T9124, relevant standards or design provisions can be followed.
2. Valve body
2.1 Valve body flange: the flange shall be cast integrally with the valve body.The type and size of iron flange shall comply with the provisions of GB/T17241.6, and the technical conditions shall comply with the provisions of GB/T17241.7;The type and size of steel flange shall comply with the provisions of GB/T9113.1, and the technical conditions shall comply with the provisions of GB/T9124.
2.2 See Table 1 for structure length of valve body.
2.3 Minimum wall thickness of valve body The minimum wall thickness of cast iron valve body shall comply with the provisions in Table 3 of GB/T13932-1992, and the minimum wall thickness of cast steel valve body shall comply with the provisions in Table 1 of JB/T8937-1999.
3 Diaphragm seat of valve cover
3.1 The connection type of valve cover and diaphragm seat, diaphragm seat and valve body shall be flange type.
3.2 The number of connecting bolts between diaphragm seat and valve body shall not be less than 4.
3.3 The minimum wall thickness of valve cover and diaphragm seat shall comply with the requirements of 2.3.
3.4 The flanges of valve cover and diaphragm seat shall be round.The type of flange sealing surface can be flat, convex or concave convex.
4. Valve rod, slow closing valve plate and main valve plate
4.1 The slow closing valve plate and valve rod shall be connected firmly and reliably.
4.2 The sealing type of slow closing valve plate and main valve plate shall be metal sealing type.
4.3 The main valve plate and valve rod must slide flexibly and reliably.
4.4 The main valve plate and main valve plate seat can be sealed by metal seal and non-metal seal.
5 Diaphragm
5.1 The diaphragm performance shall comply with the provisions in Table 2 (see the next page).
5.2 The appearance quality of the diaphragm shall comply with HG/T3090.
5.3 When it is used for drinking water, the safety of the membrane material shall comply with the provisions of GB/T17219.
6 Control pipe system
Each element of the control pipe system shall be able to withstand the maximum working pressure of the valve, and no leakage shall occur at each part.
7 Materials
7.1 Materials of main parts and components should be selected according to JB/T5300.
Flow control valve
7.2 Copper alloy castings shall comply with the provisions of GB/T12225;Grey cast iron castings shall comply with the provisions of GB/T12226, and their tensile strength shall not be less than 200MPa;Ductile iron castings shall comply with GB/T12227;Carbon steel castings shall comply with the provisions of GB/T12229;Austenitic steel castings shall comply with GB/T12230.7.3 SteelMulti function water pump control valveThe appearance quality of castings shall comply with JB/T7927. The appearance quality of iron multi-function water pump control valve castings shall refer to JB/T7927.
8 Shell strength
The shell strength of flow control valve shall comply with the provisions of GB/T13927.
Solenoid flow control valve
9 Sealing performance The sealing performance of flow control valve shall comply with the provisions of GB/T13927.
10 Cleanliness
The cleanliness of flow control valve shall comply with JB/T7748.
11 Painting
When applied to domestic drinking water, the safety of coating materials for the inner cavity of flow control valve shall comply with the provisions of GB/T17219.The external surface coating is not specified, and special requirements are indicated in the order contract.
expectation
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rare earthGiant magnetostrictive material(455) is the successor of rare earth permanent magnet, rare earth luminescence and rare earthHigh temperature superconductorThen another important new functional material.Under the action of a certain magnetic field, this material is different from the traditional nickel based or iron basedMagnetostrictive materialCompared with, it will produce much greater changes in length or volume, hence the name.Giant magnetostrictive materials have excellent properties, which make themFluid control valveHas been widely used.Recently, with the improvement of material preparation process and the deepening of magnetostrictive mechanism research, and the introduction of various advanced control technologies, space has been opened up for the development and application of giant magnetostrictive materials. As far as fluid control valves are concerned, giant magnetostrictive materials are used to develop new converters to replace traditional force feedback electro-hydraulic servo valvesTorque motorTherefore, it is possible to develop a new two-stage or even multi-stage electro-hydraulic servo valve, and developing a high-frequency on-off valve using the characteristics of giant magnetostrictive materials with high frequency response also becomes the direction of further application of materials[1]。
