Help! Steam pressure: 0.8. Methods to reduce it to 0.05–0.09 MPa. Thank you
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medium； Steam port diameter DN25. To maintain a pressure of around 0.07 MPa, I plan to install a self-acting control valve of type ZZYP-16. The pressure before the valve should be 1.0 MPa, while the pressure after the valve can be adjusted between 0.3 and 0.7 MPa. The valve should be of PN16 standard with a DN25 diameter and made of stainless steel; however, this setup does not meet my requirements as the adjustment speed is too slow. I’m wondering if a high-sensitivity pressure reducing valve could meet my needs Should a pressure reduction system be composed of a control valve and a pressure reducing valve? I seek advice from those with more experience! ! ! ! !
Considering the volume flow rate, it might be possible to use valves with a smaller diameter, and then install a buffer tank along with a precision pressure reducing valve. For applications that require precision, it is best to consult manufacturers of precision pressure relief valves; flow rate and gas usage conditions must be taken into consideration. For reference.
Thank you for the reply. It has a buffer tank now, with a pipe diameter of DN15. The moisture content in the steam is a bit high. After adjusting the existing control valve to 0.3, it can be controlled to 0.08 through the valve; once the demand increases, regulation is handled entirely by the valve, with no problems
From 1.0MPa to 0.07MPa? With such a large pressure difference, a single pressure relief valve is not sufficient to handle it. It is best to use a temperature and pressure reducer.
The pressure drop is a bit high; it is recommended to install a flow control orifice plate, with a pressure reducing valve placed after it. If temperature reduction is also required, replace the pressure regulator with a temperature-reducing pressure regulator. https://bbs.hcbbs.com/forum-304-1.html
It is best to install a temperature and pressure reduction device. Safe and effective
Let me share a real experience for your reference. Operating condition: inlet pressure of 0.8 MPa, reduced to 0.1 MPa ； Implementation process: First, use a stand-alone pressure reducing valve to reduce the pressure to 0.3 MPa, then adjust the pressure with an automatic control valve; a steam trap is installed before the adjustment ； Effect: When the inlet steam pressure fluctuates little, the requirements can generally be met using a manual valve in combination with an automatic control valve. However, adjustment is complicated during startup and shutdown, especially when the inlet steam pressure fluctuates greatly; it is difficult to maintain the pressure at 0.1 MPa, resulting in frequent activation of the safety valve. Given the operator’s operating conditions, reducing the pressure from 1.0 MPA to 0.07 MPA results in a large pressure difference; in my opinion, it is difficult to achieve satisfactory results by using a pressure reducing valve.
Without experience, one has to rely on intuition; first, use a self-acting control valve to reduce the pressure to an intermediate level (such as 0.3), followed by a buffer tank. For systems containing liquid, this buffer tank functions as a flash tank to achieve 100% dryness. A control valve is connected to the outlet pipe, and another tank is connected afterward; the pressure in this second tank is adjusted to the desired level. .