Control valves manufacturer
Thanks to the many years of experience in the production of control valves they can satisfy many industrial applications by offering you a wide range of models. In our control valve factory in China we have the ability to produce electric control valves for extreme environments , pneumatic control valve, self-operated control valve and also customize according to your specific needs!
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Self-operated pressure full stainless steel control valve
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Pneumatic film Cast Iron Flange three way control valve
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Best Pneumatic sealing single seat bellows control valve
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API factory Lever Type Direct Action Pressure control Valves
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F745X Diaphragm remote control valve
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ZZYP Self-operated control Valve
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ZMHN Lever type pressure control valve
Precautions when buying Control valve
Choice of valve type
- simple structure (the simpler the higher the reliability), the maintenance is convenient, and the spare parts are sourced
- service life
- Butterfly valve
- Single seat valve
- Double seat valve
- Sleeve valve
- Angle valve
- Three-way valve
- Ball valve
- Eccentric rotary valve
- Diaphragm valve
Choice of Executor
Choice of flow characteristics
Action mode selection
Choice of spring ranges
Choice of flow direction
Choice of fillers
Choice of accessories
More Control valve related articles
Why choose XinHui Control valves?
High-quality raw materials
Using high-quality raw materials, the quality is better than peers
Complete specifications, sufficient stock, one-stop purchase
Excellent workmanship, advanced equipment, let you rest assured
We are not only a manufacturer of valves, but also a disseminator of industry knowledge
All You Need to Know About Control valve
what is a Control valve
What is a Control valve used for?
Control valves are widely used in the industry, mainly for automatic adjustment of the liquid level, flow, pressure and temperature parameters of the equipment in the production process, and can achieve the functions of cut-off and adjustment as well as diversion.
how does a Control valve work
The regulating valve consists of three parts: the executive structure, the valve body and accessories. The executive structure is the pushing device of the regulating valve, which generates corresponding thrust according to the size of the signal pressure, so that the valve stem produces corresponding displacement, thereby driving the spool of the regulating valve to move. The valve body accessory is the regulating part of the regulating valve, which is in direct contact with the medium, and the throttling area of the regulating valve is changed by the action of the valve core to achieve the purpose of regulation.
Control Valve Structure
The regulating valve is mainly composed of valve body, valve seat, valve core, valve stem, sealing packing push rod, lower diaphragm cover, compression spring, diaphragm, upper diaphragm cover and other components.
The regulating valve can be divided into three parts, namely valve body, actuator and accessories. In terms of structure, the valve body of the regulating valve is not very different from the valve body of the ordinary globe valve. It is mainly reflected in the design of the channel and the valve core, and more attention is paid to the control of the flow rate. Due to the flow regulation, there will be a blocking effect. The rapid change of pressure difference is prone to flash evaporation and cavitation, which will cause damage to the valve body and valve core, so the hardness and cavitation resistance of the material are higher than those of ordinary globe valves.
what is a Control valve size
How to Install a Control valve
4. The regulating valve should generally be installed upright, and should be supported if it needs to be tilted.
5. The flow direction of the medium must be consistent with the arrow of the valve body.
6. The installation position of the regulating valve should be easy to observe, operate and maintain.
7. The signal tube of the actuator should have sufficient expansion and contraction allowance, and should not hinder the action of the actuator.
For details, see the Control Valve installation video.
Control valve application scenarios
OEM & ODM XinHui Control Valves Applications
T40H water supply rotary control valve-recommended for petroleum industry
T40H water supply rotary control valve is suitable for medium and low pressure boiler feed water pipes and high pressure heater drain pipes. By rotating the cylindrical valve disc to change the area of the window formed by the valve seat, so as to achieve the purpose of regulating flow. The rotary opening and closing angle of the water supply rotary control valve is 60°, which is indicated by the opening indicator plate above the control valve. It can be equipped with electric actuators for remote automatic operation.
Electric high pressure water supply control valve-recommended power station industry
In the field of industrial automation process control, the high-pressure water supply electric regulating valve is the final control element that changes the process parameters such as medium flow, pressure, temperature, liquid level, etc. by means of power operation by accepting the control signal output by the regulating control unit. Generally consists of actuators and valves.
ZMHN Lever type pressure control valve-recommended for metallurgical industry
ZMHN pressure regulating valve is composed of lever heavy hammer type diaphragm actuator and regulating valve mechanism. The post-valve type is used to keep the pressure in the pipeline behind the control valve at a constant value, and the adjustment signal is obtained from the pipeline behind the valve; the front-valve type is used to control the pressure in the pipeline in front of the valve to a constant value, and the adjustment signal is obtained from the pipeline in front of the valve. Obtained, because the direct-acting pressure regulating valve has the advantages of simple structure, reliable action, convenient maintenance, fireproof and explosion-proof, it is used in the metallurgical industry.
HTSW Bellows Control Valve - Recommended for chemical industry
The valve core adopts a single-seat plunger structure with an upper guide, and the upper valve cover adopts a bellows sealing structure to prevent the medium in the pipeline from leaking from the valve stem and packing seal. The bellows are made of high-quality stainless steel, which is anti-corrosion and has a long service life. The packing will age and wear over time, and it forms a double seal with the bellows, which greatly improves the reliability. The flow channel of the valve body is S-shaped, with small flow resistance and large flow. Especially suitable for strong corrosive, toxic and radioactive media.
ZZYP self-operated pressure regulating valve - recommended for machinery manufacturing industry
ZZYP self-operated pressure regulating valve does not need external energy, and uses the adjusted self-energy as the power source to introduce the actuator to control the position of the valve core, change the pressure difference and flow at both ends, and stabilize the pressure before the valve (or after the valve). It has the advantages of sensitive action, good sealing performance, small fluctuation force of pressure set point, etc.
Control Valve：Ultimate Guide
Control valve type
Control valve, also known as control valve, is a device in the field of industrial automation process control, which uses power operation to change and adjust process parameters such as pipeline medium flow, pressure, temperature, and liquid level. It is mainly composed of operating actuator and regulating valve body. It accepts relevant signals and changes the opening of the valve, so as to achieve continuous adjustment of the process parameters of the pipeline medium! However, there are many product types of control valves, and the control forms are changeable, and they are constantly updated and changed. Users should be familiar with this classification method! Generally speaking, the valve body of the regulating valve is universal and can be matched with electric actuators or other actuators. It can be divided into three types according to the control actuators: electric regulating valve, pneumatic regulating valve and self-operating regulating valve.
Electric control valve
Pneumatic control valve
Self-operated control valve
- straight stroke (single seat valve, double seat valve, sleeve valve, cage valve, angle valve, three-way valve, diaphragm valve)
- angular stroke (butterfly valve, ball valve, eccentric rotary valve, full-featured ultra-light control valve)
Classification by use and function
The regulating valve is used to regulate the flow, pressure and liquid level of the medium. According to the signal of the adjustment part, the opening of the valve is automatically controlled, so as to achieve the adjustment of the medium flow, pressure and liquid level. The regulating valve is divided into electric regulating valve, pneumatic regulating valve and hydraulic regulating valve, etc. Two commonly used are electric control valve and pneumatic control valve.
The regulating valve consists of two parts, an electric actuator or a pneumatic actuator and a regulating valve. Control valves are usually divided into two types: straight-through single-seat control valve and straight-through double-seat control valve. The latter has the characteristics of large flow capacity, small unbalance and stable operation, so it is usually especially suitable for large flow, high pressure drop and leakage. few occasions.
The flow capacity Cv is one of the main parameters for selecting the control valve. The flow capacity of the control valve is defined as: when the control valve is fully opened, the pressure difference between the two ends of the valve is 0.1MPa, and the fluid density is 1g/cm3, the hourly flow path The flow rate of the regulating valve is called the flow capacity, also known as the flow coefficient, expressed in Cv, and the unit is t/h.
The flow characteristic of the regulating valve is the relationship between the relative flow of the medium flowing through the regulating valve and its opening degree under the condition that the pressure difference between the two ends of the valve remains constant. There are three kinds of flow characteristics of regulating valve: linear characteristic, equal percentage characteristic and parabolic characteristic.
The meanings of the three fluence properties are as follows:
- Equal percentage characteristic (logarithm)
The relative stroke and relative flow of the equal percentage characteristic are not in a linear relationship. At each point of the stroke, the flow change caused by the unit stroke change is proportional to the flow at this point, and the percentage of flow change is equal. Therefore, its advantage is that when the flow rate is small, the flow rate change is small, and when the flow rate is large, the flow rate change is large, that is, it has the same adjustment accuracy at different opening degrees.
- Linear characteristic (linear)
The relative stroke of the linear characteristic and the relative flow are in a linear relationship. The flow change caused by the change of unit stroke is constant. When the flow rate is large, the relative flow value changes little, and when the flow rate is small, the relative flow value changes greatly.
- Parabolic characteristics
The flow is proportional to the two sides of the stroke, and generally has an intermediate characteristic between linear and equal percentage characteristics. From the analysis of the above three characteristics, it can be seen that in terms of its adjustment performance, the equal percentage characteristic is the Z best, and its adjustment is stable and the adjustment performance is good. The parabolic characteristic has better regulation performance than the linear characteristic, and any one of the flow characteristics can be selected according to the requirements of the application.
Pressure regulating valve, also known as self-operated balancing valve, flow control valve, flow controller, dynamic balancing valve, and flow balancing valve, is an intuitive and simple flow regulation and control device. Under the action of water, the valve can automatically eliminate the residual pressure head of the pipeline and the flow deviation caused by the pressure fluctuation, and keep the set flow unchanged no matter how the system pressure changes. These functions of the valve make the flow adjustment of the pipeline network completed at one time , turn the network adjustment work into a simple flow distribution, and effectively solve the hydraulic imbalance of the pipe network.
The pressure (pressure) at which the substance is in a critical state is called the critical pressure, so what is
the critical pressure of the control valve? Each medium of the control valve is different, the critical
temperature is different, and the critical pressure is also different.
For example: the critical pressure of water is 22.12MPa and the critical temperature is 374.3℃. That is to say,
when the water exceeds the critical temperature of 374.3°C, no matter how the pressure is increased, the gas
(water) cannot be liquefied. When the critical temperature of water is 374.3°C, the minimum pressure to
liquefy the gas (water) is 22.12MPa.
The actuator is the supporting product of the electric regulating valve and is composed of a motor, a reducer, a transmission shaft and a bearing, etc. Its function is to accept the signal from the regulator (electrical signal or air source pressure) to drive the valve core to complete the opening action and realize flow control.
The actuator of the electric regulating valve is different from the ordinary valve structure!
It does not adjust the flow by changing the throttling area, but by changing the stroke.
Therefore, the electric regulating valve has obvious advantages over the traditional throttling instrument:
small size and light weight
- large output torque
- sensitive response
- convenient and flexible operation
- remote control and so on
There are many types of actuators for electric control valves, and there are two commonly used types: diaphragm actuators and piston actuators.
Diaphragm actuator is a double-acting piston-type actuator composed of a porous diaphragm divided into two halves.
Its characteristic is that when the medium pressure increases, the partition plate is moved to generate a top-opening force, which pushes the diaphragm and the push rod down to compress the medium in the spring cavity to produce a shut-off action.On the contrary, the diaphragm is pushed up to close the channel to achieve the purpose of adjusting the flow.
The advantages of this type of actuator are large thrust, long stroke and good sealing performance.
The disadvantage is that it is easy to be deformed under pressure and requires high processing accuracy.
Therefore, it is generally used in high-pressure and large-diameter occasions, such as high-pressure three-way cock butterfly check valve, etc. The difference between the diaphragm type and the piston type is that the former is single-acting and the latter is Multi-function, the former is suitable for low pressure difference and small flow, the latter is suitable for high pressure difference and medium or above flow.
The flow capacity Cv value is one of the main parameters for the selection of the control valve.
The definition of the flow capacity of the control valve is: when the control valve is fully opened, the pressure difference between the two ends of the valve is 0.1MPa, and the fluid density is 1g/cm3, The flow rate of the flow path regulating valve per hour is called the flow capacity, also known as the flow coefficient, expressed in Cv, the unit is t/h, and the Cv value of the liquid is calculated as follows.
The nominal diameter DN of the regulating valve can be determined by looking up the table according to the value of the flow capacity Cv.
The flow coefficient Kv of the regulating valve is an important parameter of the regulating valve, which reflects the ability of the regulating valve to pass the fluid, that is, the capacity of the regulating valve. According to the calculation of the flow coefficient Kv of the regulating valve, the diameter of the regulating valve can be determined. In order to correctly select the caliber of the regulating valve, the Kv value of the rated flow coefficient of the regulating valve must be correctly calculated. The definition of the rated flow coefficient Kv of the regulating valve is: under the specified conditions, that is, the pressure difference between the two ends of the valve is 10Pa, and the density of the fluid is the number of flow through the regulating valve at the rated stroke.
What is the difference between CV and KV in a control valve?
How much air does the control valve use?
Q = piston area x piston speed x absolute pressureThe usual formula is:Q = 0.046D²v (p+0.1)