There are two functions:
1, to prevent the sudden loss of pressure at the oil inlet of the large cavity from causing the oil cylinder to drop;
2, to prevent the danger of excessive oil return speed caused by load inertia.
Balance valves are also commonly used in hydraulic motors.
The balance valve is a valve that plays a dynamic and static balance adjustment role under hydraulic conditions. Balance valves can be divided into three types: static balance valves, dynamic balance valves and differential pressure independent balance valves. Static balance valve is also called balance valve, manual balance valve, digital locking balance valve and two-position regulating valve. It changes the flow resistance through the valve by changing the gap (opening) between the valve core and the valve seat and adjusting the Kv (valve flow capacity) of the valve, so as to achieve the purpose of adjusting the flow.
The principle of balance valve is to adjust reversely in the valve body. When the pressure at the inlet increases, it automatically reduces the diameter and reduces the change of flow, and vice versa. If the connection is reversed, the regulating system will not work. Moreover, the regulating valve is directional, and the reverse pressure can even reduce or even close the flow.
Because the balance valve is installed for better heating, there is no problem of reverse installation. If it is anti-installation, it is a human error, and of course it will be corrected. Balance valve belongs to the category of regulating valve, and its working principle is to change the flow resistance of fluid flowing through the valve by changing the gap between the valve core and the valve seat, so as to achieve the purpose of regulating the flow.
Extended data:
Characteristics of balance valve:
1, with ideal regulation performance;
2. Excellent cut-off function;
3. Open display accurate to110 period;
4. The theoretical flow characteristic curve is an equal percentage characteristic curve;
5. National patent opening and closing locking device;
6. Each whole circle corresponds to a related flow coefficient. When debugging, as long as the pressure difference between the two ends of the valve is measured, the flow through the valve can be calculated conveniently;
7, PTFE and silica gel seal, reliable sealing performance;
8. The internal components are made of YICr 18Ni9 or copper alloy, which has strong corrosion resistance and long service life;
9. Stem from internal promotion, so there is no need to reserve operating space.
10, which is a combination valve.
Easy to use: the project construction is flexible, and the installation of the project or the use of equipment by stages will not affect the balance of the water system;
Easy to change: when the water system in some areas needs to be redesigned, it will not affect the water system design and balance in other areas;
Reduce power consumption: due to the balance of the whole water system, the refrigeration unit (boiler, heat exchanger) and water pump are guaranteed to operate in the best working state, and the energy saving effect is obvious;
Reduce wear and waste: because the water flow is guaranteed not to exceed the original design, the durability of all equipment is guaranteed, and the copper pipe loss caused by excessive flow is avoided;
Improve safety: Because the flow balance of water system is automatic, the possibility of man-made destructive adjustment is eliminated.
For designers, the reduced workload is more flexible and reduces the workload. There is no need to calculate the resistance of the whole pipeline, which speeds up the design. We can boldly use different program systems: save the cost of pipeline, corresponding materials and installation, and leave the work of balancing hydraulic system to the dynamic flow balancing valve; Many other troubles caused by unbalanced water system can be avoided.
References:
Baidu encyclopedia-balance valve