1. Structural characteristics

The WY series temperature and pressure reduction device is the third generation temperature and pressure reduction device designed by our company based on years of design and manufacturing experience, as well as the absorption of excellent product structures from abroad, through technological optimization.

The temperature and pressure reducing device consists of a pressure reducing system (temperature and pressure reducing valve, throttle orifice plate, etc.), a temperature reducing system (high-pressure differential feedwater regulating valve, throttle valve, etc.), and a safety protection device (safety valve, check valve). The main features are as follows:

1) By adopting a temperature and pressure reducing valve structure, steam temperature and pressure reduction can be carried out in the same valve, greatly reducing the length of the entire device, minimizing the footprint, and lowering project investment.

2) Adopting a straight stroke double seat cage type temperature and pressure reducing valve structure, the valve is equipped with a throttle mesh cover to enhance the atomization effect of the cooling water, protect the valve seat and body, extend the service life of the valve, and also reduce the noise of the device. The double seat valve has small unbalanced force, wide adjustment range, smooth operation, and will not cause jamming. The sealing surface of the sub high pressure temperature and pressure reducing valve is welded with cobalt based ERCrMn-C-15, which is resistant to high temperature and erosion; The valve seat and disc are ground together for good sealing performance, overcoming the disadvantage of large leakage of double seat valves, and suitable for a temperature of 510 ℃.

3) The temperature and pressure reducing valve is equipped with an atomizing nozzle inside, and the temperature reducing water passes through the water chamber inside the valve core, spraying at a flow rate of up to 23m/s. The throttling between the valve disc and the valve seat inside the temperature reducing valve maintains a high flow rate of steam (i.e. at the spray point of the temperature reducing water), thus achieving good atomization effect even at low steam flow rates.  

4) Noise reduction. The throttle hole cover installed inside the temperature and pressure reducing valve, as well as the throttle orifice plate behind the valve, not only play a role in reducing pressure and atomization, but also have a main function of reducing noise in the system. The main principle is its small hole noise reduction.

5) Flow characteristics of temperature and pressure reducing valve: Linear or corrected percentage characteristic curve, can be accurately controlled within the full stroke range, ensuring that the secondary steam is within the rated output range of 10% to 100%, and the equipment runs stably for a long time. Leakage level: Level IV.

6) The temperature water supply regulation system adopts a straight stroke high-pressure differential regulating valve, which can reasonably distribute the pressure difference on the water supply system; There are different flow coefficient Cv values to choose from for high-pressure differential water supply control valves of the same caliber, greatly improving the sensitivity and accuracy of temperature regulation systems.

7) The electric temperature and pressure reducing valve and electric water supply regulating valve are equipped with a straight stroke electric actuator, which eliminates the traditional lever hinge mechanism, reduces the idle stroke link, and further improves the sensitivity and accuracy of the regulating system.

2. System diagram