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8 Descaling ValVes Master Orifices all of pressure letdown(breakdown) orifice are designed by a experienced professional engineer using sophisticated computational fluid dynamics tool. PuMP By-Pass ValVes & systeM The pump bypass valve system of a steel rolling mill plant consists of a descaling valve, orifice and flow patterner. When the bypass valves perform a minimum flow control function of pump to protect against overheating, the pump bypass valves are designed to ensure fluid structural integrity of the trim against severe duty cavitation. PuMP ByPass PiPing Figures OF descaling systeM Flow locatable Pipe line (straight) a Patent Hi-Fluidic Master descaling Valve Hi-Fluidic Master Orifice Flow Patterner is functioning a device of flow straighten the severe turbulent flow due to extremely high flow speed. also the flow patterner to absorb the vibration and noise of the piping. normally under the high speedy fluid flow in pipe obstructions locatable Pipe line (straight) Patented Hi-Fluidic Flow Patterner scale sluice trench such as elbow, tee, and branches cause the obstructions to make severe erosion problems. The severe fluid flow and its dynamic flow become calming and mild flow due to the inside long straighten orifice, fair ring of the end of orifice, and flow divider .
Master Pump Minimum Flow Control Valves When a motor or turbine-driven boiler feedwater discharge flow. some of the energy generated from the pumping action is converted to heat. if the pump discharge flow falls below a set minimum level there is a rapid increase in both temperature and pressure within the pump. This increase can cause mechanical pump damage due to caviattion or excessive pressures. To guard condenser deaerator tank Boiler Feed Pump condenser discharge deaerator storage tank Feedpump Minimum Flow or recirc. Valve Main supply to Boiler Or reactor MiniMuM FlOW ValVe requireMents: against this problem, a minimum flow line is used downstream of the pump charge. The minimum flow line takes the full discharge pressure from the pump and passes a set minimum flow to either the deaerator(deaerator tank) or the condenser. The feedwater valve cannot serve this purpose as the full head of the boiler is on the feedwater valve outlet at start-up. For a valve to be successful in the service with high differential pressures, it must be able to deal with four general problems. • The valve must be able to protect its trim from cavitation damage between initial valve opening and full valve opening. • The valve must be able to deal with foreign matter and pipe scale entrained in the flow stream. Foreign matter will cause problems to the valve trim. • The valve must able to provide zero leakage as any leakage in the service will cause wire-drawing across the seat and trim failure occur. • The valve must be able to maintain zero leakage throughout a normal service life. This is the most difficult requirement for a pump minimum flow control valve. Pump Minimum Flow control Valve be designed to meet the above requirements. One of the severe potential problems in pump minimum flow line is the intrusion of foreign dirty particles. Trim technology cover well known brand trims over the world based on a velocity profile and pressure profile. In case dirty water or containing impurities fluid service the use of pressure profile trim is most primary selection. But very high differential pressure drop service primary selection of the trim should be based on a velocity profiles. But all the case the pump minimum flow control valve shall be no seat leakage trim. We know the severe duty service trim technology that you prefer & familiar valve manufacturers. We can solve the problems of those valves and serve for customers with more better solution in valve product. Descaling ValVes For pump minimum flow control, the valve have to be satisfied against severe cavitation phenomenon due to high differential pressure across the valve trim. the trim is designed and analyzed by ingenious design tools such as cFd. above is a sample figure of cavitating analysis of the trim of minimum flow control valve. 9
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