Balance principle and characteristics of pneumatic valve

balance is equivalent to a pneumatic valve throttling element of local resistance to change of incompressible fluid, the flow equation is available. Compared with the other pneumatic valves, balance the pneumatic valve has the following characteristics:
( The linear flow characteristic, namely under the condition of constant pressure difference before and after pneumatic valve, flow with a linear relationship with opening in general;
( The accurate opening instructions;
( Opening the lock, the managers can't literally change the opening; Table joins, can easily show before and after pneumatic valve differential pressure and flow pneumatic valve flow.
although balanced pneumatic valve has many advantages, but its application in air conditioning water system still exists many problems. If these problems is not good, balance the characteristics of the pneumatic valve is not fully revealed. Balance the pneumatic valve is used to adjust the system, each distribution point ( As each building block) Due to traffic. Every building at the entrance to the balanced pneumatic valve installation, can make the total flow of heating system reasonable allocation.
ZLF type self-reliance type balance principle of the pneumatic valve is pneumatic valve body of regulation, when the entrance pressure, automatically reduced size, reduced the change of the flow, and vice versa. If the reverse, the regulation system doesn't work. Pieces of pneumatic valve and regulating role, is a directional, even can reduce even closed reverse pressure flow. Since the balanced pneumatic valve installation is in order to better heating, there is no reverse loading problem. If it is the outfit, it is human error, of course will be correct. Balanced pneumatic valve belong to the category of regulating pneumatic valve, its working principle is by changing the clearance between the pneumatic valve seat and pneumatic valve core ( The opening) , change the flow resistance of fluid flows through the pneumatic valve, to achieve the purpose of flow adjustment. Balance the pneumatic valve is equivalent to a throttling element of local resistance to change of incompressible fluid, the flow equation is available.
Kv to balance coefficient of pneumatic valve pneumatic valves. It is defined as: when the balance before and after pneumatic valve differential pressure of the bar ( About KGF/cm) , the balance of pneumatic valve flow values ( m/h） 。 Digital lock balance of pneumatic valve fully open the pneumatic valve coefficient of normal flow capacity of pneumatic valve. If the balance of the pneumatic valve opening is kept constant, pneumatic valve coefficient Kv unchanged, that is to say, the pneumatic valve coefficient Kv by opening. Obtained from the measured coefficient under different opening of pneumatic valve, pneumatic valve is balance can be as a quantitative flow adjusting throttle element.