Labyrinth multi-stage globe type control valve, DN250, 600LB, The medium is refined oil, 93# 97# diesel, and the inlet pressure 8.3MPa, outlet pressure 0.4MPa, the differential pressure is very large.
The original failure phenomenon: the flow of the control valve decreases and the opening becomes larger after a period of operation.
After our engineer to inspect on-site, we found that a large number of impurities were blocked at the inlet of the flow hole of the cage, which caused the valve flow to decrease.
Reason: Because the flow hole of the multi-stage control valve’s cage is a 4mmx4mm labyrinth, the impurities in the pipeline are mostly sand and iron, which are stuck in the flow hole under the impact of high pressure and cause a blockage.
Solution: Change the flow hole of the multi-stage trim cage to 6mmx4mm labyrinth, in case to reduce the number of pressure reduction stages. At the same time, install a filter valve upstream of the control valve.
Since the renovation, the valve has been running well.
Petrochemical Industry
Industry Fields
Petrochemical
Fine Chemical
Basic Chemical
Gasification Plant
PP or PE, MTO, DMTO
Coal Transportation Pipeline
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Modification project of flow characteristics of control valves at the feedstock inlet of Wuhan Petrochemical No. 2 catalytic unit.
Problem:
Tag No. FV105 and FV106 control valves are installed at the inlet port of the raw material. The raw material flow rate control needs to be very precise, especially when the flow rate is adjusted between 60~70 Ton. It needs to be adjusted according to the flow rate of 0.5 Ton each time. Due to the high adjustment accuracy requirements, After the valve is put into automatic operation, there will be 5%~10% fluctuations, affecting the end user’s normal production. The user can only change to manual operation, but it can only be set at 0.5% each time the valve position is given. Even then, Due to the positioner’s dead zone and the deviation of the valve itself, precise adjustment cannot be achieved.
Special Design: Cage-guided globe type control valve, with a special design of the flow window:
When the flow rate is below 33 Ton, the flow characteristic is an equal percentage; when the flow rate is 60~70Ton, the flow characteristic is linear; when the flow rate is above 70Ton, the flow characteristic is an equal percentage. In this way, it can meet the adjustment of small flow and large flow rate and meet the precise adjustment of valve opening between 56% and 75% when the flow is 60 ~ 70Ton. To realize the problem of the design flow characteristics of the partition.
FV105 And FV106 Control Valves
Natural Gas LNG
Industry Fields
Pipelines
Oil and gas stations
Natural gas station
LNG transmission pipeline
LNG station
Oil refinery
Underground oil storage
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Case Studies
Shannxi Coalbed methane 60000Nm³h Natural Gas Liquefaction LNG Device
The raw gas purification equipment purifies the raw gas so that the acid gas content in the raw gas meets the process requirements. The purification process is simple to operate, low energy consumption, and has a wide range of applications. It can be used for various common natural gas sources. The main application is a multi-stage speed control valve, which is convenient to control the natural gas source with impurities.
Natural gas liquefaction uses a high-pressure refrigerant to achieve the liquefaction of natural gas through the adiabatic expansion of the Claude cycle refrigeration of the turbo expander. When the gas expands and cools in the expander, it outputs work to drive the compressor in the process. The nitrogen expansion cycle process is simple and compact, and the cost is relatively low. Quick start, full load products can be obtained within 2 to 4 hours of the hot start, flexible operation, strong adaptability, easy operation and control, good safety, and emptying will not cause fire or explosion hazard.
Main features of the device
The device is highly intelligent and integrated;
Innovative purification technology, lower energy consumption, and smaller equipment;
Modularization of public works and container control;
Each module is controlled by PLC, and PLC communicates with the host computer through TCP/IP protocol, reducing instrument wiring;
The complete control scheme, simple operation, and stable performance.
Applicable scope of the device
Unconventional natural gas (shale gas, coal bed methane, biogas);
Remote gas wells (isolated well, single well, test well);
Oilfield associated gas, salt well-associated gas;
Industrial exhaust gas and fuel gas converted from biomass.
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Flow rate measures the volume of fluid that passes through a specific point within a given time frame, commonly used units include cubic meters per hour (m³/hr), liters per minute (L/min), gallons per minute (GPM) for the U.S. customary system, and cubic feet per hour (ft³/hr). LPS (l/sec) LPM (l/min)
FV105 And FV106 Control Valves
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