Because the valve adopts scientific design principles, reasonable internal structure, selection of excellent materials and original process methods, our company's minimum flow valve has the following unique advantages:
Using the principle of cyclic convection multi-stage pressure reduction structure, effectively avoiding cavitation and erosion, and greatly extending the service life;
All the internal parts of the valve can be quickly disassembled and replaced, and the maintenance is extremely convenient. Eliminate the trouble of cutting and welding the valve body, greatly saving maintenance costs and time;
The stem packing is imported from the United States Garlock, no leakage, no frequent replacement;
The structure is scientific, the material is excellent, and the craftsmanship is exquisite. The valve core and cage have good anti-blocking and anti-blocking performance. When the valve is frequently opened, a small amount of debris in the pipeline will not block the passage, and the valve core is not easy to block;
The valve core and cage materials are matched appropriately, resistant to abrasion, abrasion, and seizure;
The noise is much lower than similar products;
The seat valve core seal achieves zero leakage, which is rare in the industry. It is very important to ensure the long service life of the valve;
Long life and low failure rate ensure the safe and reliable operation of the feed water pump, save operating costs, and improve economic benefits.
PS: The minimum flow circulation valve is also called: the minimum flow valve, recirculation valve and pump protection valve.
The minimum flow recirculation valve (minimum flow valve) is a key equipment supporting the boiler feed pump in the power plant.
The feed water pump pressurizes the boiler water from the deaerator to 20-30Mpa or above, sends it to the high-pressure feeder, and finally enters the boiler. These feedwater pumps need to pass the minimum flow rate to bring out the heat generated during operation, prevent overheating of the pump, and avoid damage caused by cavitation of the pump blades. When the unit has just started and is about to be shut down, the boiler feed water flow is very small, and in the event of an accident, the boiler water demand will also decrease. In order to ensure the normal operation of the pump, a recirculation system needs to be installed at the outlet of the pump to return part of the feed water from the outlet of the pump to the deaerator.
Circulating convection principle, multi-stage pressure reduction structure-brand new design concept
The circulating convection control valve is developed on the basis of the porous anti-cavitation valve cage structure, the multi-stage spool throttle control valve structure, and the labyrinth laminated control valve structure. It is a new generation of high pressure difference anti-cavitation control valve product. The key part of the circulating convection control valve-the circulating hedging disc. Due to the special structure and craftsmanship, compared with the currently popular labyrinth discs, this disc has a similar shape but very different functions and principles. Circulating convection disc is to process several grooves that are opposed by each fluid on the disc. The groove path is tortuous and curved. The direction of the fluid is changed more than ten or even dozens of times to increase the resistance and gradually reduce the pressure, which can prevent Cavitation and cavitation occur during the depressurization process. The grooves are intersected by concentric annular grooves and radial grooves. The adjacent flow channels can communicate with each other. The fluid flows from the outer ring to the inner ring through the radial grooves. During the process, a part of the fluid is divided into two and flows back to form an opposition with the part of the fluid coming from another channel. The force of the fluid is used to reduce the speed of the fluid, while the other part of the fluid merges into one and merges in opposite directions. .
High-speed flowing molecules produce collisions, frictions and vortices, which consume a lot of energy and reduce pressure more effectively. The pressure drop effect is better than the labyrinth disc, the anti-cavitation, noise reduction effect is better, and the service life is longer.
Nominal Confucian Classics: 3/4″～ 6″
Pressure rating: ANSI 150Lb ~ 2500Lb
Valve body type: straight type, angle type
Operating temperature: -29℃～575℃
Flow characteristics: equal percentage, linear
Actuator: electric or pneumatic actuator
Leakage: Comply with ANSI B16. 104-1978 Class V (Class VI seal can be used)
Whether pneumatic or electric valve, there is a handwheel mechanism, which can be operated manually when losing air or power, without interrupting the production process.