The GLZ high-pressure flow self-control instrument is a high-tech product that combines mechanical and electrical integration, which is the first of its kind both domestically and internationally. It is a key new product of the country and Shanghai. This product organically integrates flow meters, regulating valves, controllers, and intelligent wireless communication interfaces. It has the characteristics of compact structure, easy operation, intuitive display, high control accuracy, corrosion resistance, high temperature resistance, anti scaling, manual and automatic flow control, movable component type, non movable component type, and non shear type. Especially suitable for high-pressure water injection and polymer injection projects in oil fields. Its emergence has solved the problem of stable water injection, quantitative water injection, and accurate water injection that oil fields have been unable to achieve in high-pressure water injection and high-pressure polymer injection for many years, saving a lot of manpower and material resources, and providing technical support for oil fields to reduce transmission differences and increase production. The product minimizes the damage to the formation structure caused by oilfield water injection to the greatest extent possible. It also has solar green energy power supply technology, which can easily achieve various functions such as metering, control, remote output, and remote control without the need for an external power source. It has made a positive contribution to the environmental protection cause of all mankind.
The wireless communication interface is easy to achieve remote monitoring of the site. The application of advanced electronic technology endows the entire controller with high stability and anti-interference ability.

working principle
The working principle of GLZ high-pressure flow controller is that the controller collects various signals from the flow meter and analyzes and compares them with pre-set values. If various signals collected from the flowmeter deviate from the pre-set values, the controller will issue correct adjustment instructions to the actuator, which will adjust the opening degree of the valve to achieve the pre-set values of the GLZ high-pressure flow controller and achieve closed-loop automatic flow control. The GLZ high-pressure flow self-control instrument is divided into three parts based on its structure: "flow measurement", "flow regulation mechanism", and "controller" (flow control and data communication).

Flow measurement principle
The principle of flow measurement can be divided into three types: measurement with movable parts, measurement without movable parts, and measurement without shear.
a) There are movable parts
When the measured medium flows through, the flowmeter generates a pulse signal, which is processed by the circuit and transmitted to the controller. Flow meters can measure various conductive media and high-temperature, low viscosity oil products, and have strong adaptability to high-pressure water injection in oil fields. The measuring element of the flowmeter adopts a special structure with specially treated impellers, shafts, and bearings. Features: High precision, long lifespan, strong adaptability to low flow rates, strong seismic resistance, and high reliability.
b) No movable parts
A new flow measurement technology is developed by combining electromagnetic induction with the Karman vortex principle. When a conductive liquid flows through a vortex generator, it forms regular and staggered vortices in a magnetic field. Using the piezoelectric principle or cutting bias magnetic field lines, an electrical signal with the same frequency as the vortex is generated. After being detected by the probe, the signal is processed to filter out interference and converted into a flow signal to be transmitted to the controller. Features: High precision and good stability, long lifespan, no jamming phenomenon. Structurally, it adopts our company's unique patented technology of inserting a quick release core structure, which is easy to remove from the case and achieve easy interchangeability, bringing great convenience to the periodic calibration of flow meters.
c) No cutting type
The organic combination of unlined electromagnetic flowmeter and shear free high-pressure cone valve forms a new integrated high-pressure flow self-control instrument, which completely solves the shear free metering and control in oilfield polymer injection process. An unlined electromagnetic flowmeter can better ensure high pressure reliability, no moving parts, no shear, high precision, and strong adaptability. The shear free high-pressure flow self-control instrument is a new product pioneered and patented by our company.
actuator
When the executing mechanism receives instructions from the controller, it adjusts the opening degree of the valve according to the instructions to achieve the goal of automatically adjusting the high-pressure water injection/polymer injection flow rate. The executing mechanism consists of a deceleration device, an executing device, a motor drive device, and a high-pressure valve.
The actuator has functions such as valve position indication, electronic limit, mechanical limit, and manual adjustment of electronic position display meter. When manually adjusting the valve, due to the action of the deceleration device and the valve pressure self balancing system, the handwheel is very light and easy to adjust accurately Save time and effort.
Valve types include: ring type regulating valve, cone type regulating valve (not suitable for large differential pressure conditions), and shear free regulating valve.
Controller
The controller is powered by internal batteries for flow display and control, and advanced electronic technology enables the entire controller to have high stability and anti-interference ability. During use, the user sets the flow rate value through the setting key, and the controller compares the actual flow rate value with the set value. If it does not meet the set requirements, the controller will issue a command to drive the motor to rotate forward or backward to adjust the valve, so that the instantaneous flow rate value approaches or equals the set value.
In addition, the self-control instrument also has a flow ratio function. During the ratio process, the flow signals of other flow meters are collected and multiplied by the proportional value (considering the flow range of the self-control instrument during use) to control the opening and closing of valves, achieving proportional metering adjustment (optional).
function extension
Pressure prevention backflow type use
The pressure controlled high-pressure flow controller has an inlet and outlet pressure detection function. When the pressure at the front end of the instrument is lower than the pressure at the back end, the valve can be automatically closed to prevent the medium from flowing back. The display adopts a large screen LCD, which can display the working status such as instantaneous flow rate, cumulative flow rate, inlet pressure, and outlet pressure. When the pressure returns to the front pressure of the instrument being higher than the rear pressure of the instrument, the valve automatically opens and is controlled according to the set flow rate.
Additional component configuration
RS485 communication protocol: YN2005RS
a) RS485 communication specifies the corresponding electrical standards, which define the logic level using the differential signal between the A and B terminals. Adopting half duplex data reception and transmission. The communication adopts YN2005RS and MODBUS RTU protocols:
Format: Data bit -8 bits, Stop bit: 1 bit, Check bit: None
Data type: BCD code
Sending timing: low first, then high
Data format - Computer reception (slave end - instrument end)
b) MODBUS RTU protocol
For RS485 communication type products: The MODBUS RTU protocol is included in the product information package during shipment.
wireless communication
Wireless data transmission is mainly used for bidirectional transmission of data over short to medium distances. It does not require network support, has no network communication costs, and is suitable for data collection and control over tens of kilometers.
GPRS communication
GPRS/CDMA is a paid service provided by mobile communication, which is a wireless packet transmission service that enables remote data download and upload. Suitable for ultra long distance data collection and control. Note: The above three methods can all provide system configuration for a fee.
Self provided green energy supply (solar energy)

For situations where AC2200 power supply is not available on site, use self provided power supply and utilize solar energy to provide energy This power supply system includes charging control and discharging control. The flow regulation adopts low-power driving technology to ensure that the self provided power supply can provide the energy required for 5 days of control, and can also ensure normal regulation in case of insufficient light.

Medium temperature: (0~+120) ℃;
Work pressure: 16, 25, 32, 42 (MPa);
Allowable pressure difference: ≤ 10MPa;
Explosion proof grade: Exd Ⅱ BT4;
Power supply: AC220V ± 10%/50Hz, AC24V ± 5%, DC24V ± 10%;
Wireless communication frequency band: 2.4GHz, communication distance ≤ 1km (optional);
Input thread: G1/2;
Environmental conditions:
Environmental temperature: (-20~+50) ℃ (conventional type), low temperature type: (-45~+60) ℃;
Relative humidity: ≤ 85% (+25 ℃);
Atmospheric pressure: (86-106) kPa.