In modern automatic control, the control valve plays a very important role. The proper distribution and control of flowing liquid, gas, or solid powder requires a control valve to complete. The low-pressure pneumatic conveying device uses a blower as a power source, and the fan is at the front end of the feeding device, and the powder in the silo continuously goes high through the feeding device. In modern automatic control, …
1. INCREASE THE STIFFNESS METHOD For oscillation and slight vibration, the stiffness can be increased to eliminate or weaken. For example, it is feasible to use a spring with a large stiffness and a piston actuator. 2. INCREASE THE DAMPING METHOD Increasing the damping increases friction against vibration. For example, the valve plug of the sleeve valve can be sealed with an “O” ring, and a graphite filler with …
8 ways to solve the vibration problem of the control valve Read More »
DRIVING ENERGY The most commonly used driving energy source is the power source or fluid source. If the power source is selected as the driving energy source, the three-phase power source is generally selected for the large-size valve, and the single-phase power source is selected for the small-sized valve. General electric actuators are available in a variety of power types. Sometimes DC power can be selected. At this time, the …
4 Major Elements to Selecting a Suitable Regulator Valve Actuator Type and Specification Read More »
Pneumatic control valves often present some troublesome problems during use. For example, if the pneumatic control valve is not tight and the door is not tight, what should I do? Under normal circumstances, if it is not critical, first check to see if the valve is closed. If it is closed, it is still leaky and can not be sealed. Then look at the sealing surface condition, some valve sealing pair It …
The reason for and treatment of the pneumatic control valve is not tight Read More »
The working model of the pneumatic control valve is air opening and gas closing. The opening of the air opening valve increases with the increase of the signal pressure. When there is no pressure signal, the valve is in the fully open state, and the gas closing is the opposite. Reasonable selection of the mode of action of the control valve is essential to ensure production safety, improve product quality and reduce economic …
How to correctly choose the positive and negative ways of the pneumatic control valve Read More »
As an important element in the flow control system, the control valve adjusts the medium flow rate of the system by changing its own resistance characteristics. Its regulating quality affects the efficiency and stability of the entire system. Design the control valve according to the regulation needs of the system. The key is to design the control valve structure and the flow area distribution of the valve core. The …
Valve products have been widely applied in petroleum, chemical engineering, nuclear power, metallurgy, electric power, hydraulic power, large coal chemical industry and other industries. Total quantity of valve products is constantly growing. Valve technology is developing and application of valve is also expanding continuously. Valve standards relative to valve products are showing their importance in at present. Valve products have been widely applied in petroleum, chemical engineering, nuclear power, …
A control valve is a valve used to control fluid flow by varying the size of the flow passage as directed by a signal from a controller.[1] This enables the direct control of flow rate and the consequential control of process quantities such as pressure, temperature, and liquid level. In automatic control terminology a control valve is termed a “final control element”. Contents Operation Control action Valve positioners Types of …
From Wikipedia, the free encyclopedia Cavitation is the formation of vapour cavities in a liquid, small liquid-free zones (“bubbles” or “voids”), that are the consequence of forces acting upon the liquid. It usually occurs when a liquid is subjected to rapid changes of pressure that cause the formation of cavities in the liquid where the pressure is relatively low. When subjected to higher pressure, the voids implode and can …
