Multifunctional piston hydraulic control valve is a patented product of our company. It has the characteristics of hydraulic automatic control, slow opening when starting the pump, fast closing first and then slow closing when stopping the pump. It has the functions of check-in and elimination of water hammer. It is suitable for supporting automatic water supply and drainage control system to effectively improve the safety and reliability of water supply.

Model example:

BFDS101HX-16C	Multi function hydraulic control valve 1.6 MPa cast steel valve body hard and soft double sealing
BFDS201HX-25C	Signal type multifunctional hydraulic valve 2.5 MPa cast steel valve body with soft and hard double sealing
BFDS102HX-10Q	Floating ball valve 1.0 MPa ductile iron valve body hard and soft double sealing
BFDS104HX-6Q	Pressure reducing and stabilizing valve 0.6 MPa ductile iron valve body soft and hard double sealing
BFDS107HX-10Z	Pressure relief and pressure holding valve 1.6 MPa cast iron valve body with soft and hard double sealing

1) Basic structure:
It is composed of main valve and external control components. The main valve is composed of valve body, large and small valve plates, valve stem, valve cover, valve seat, piston and piston cylinder. The external control components are composed of micro check valve, regulating valve, filter and corresponding pipeline. In the external control assembly, one channel connects the inlet end of the valve with the lower chamber of the piston cylinder, and the other connects the outlet end of the valve with the upper chamber of the piston cylinder
2) Working principle:
The opening and closing of the valve depends on the pressure of the delivered medium and the pressure difference in the piston cylinder. The action time is controlled by the control valve in the external control module. The opening and closing of the valve is completed by large and small valve plates. The large valve plate plays the role of fast opening and closing, and the small valve plate plays the function of slow opening and closing. It should be noted that the opening of the large valve plate is controlled by the small valve plate. Only when the small valve plate acts, the large valve plate can act.
After starting the pump, the medium enters the lower chamber of the piston cylinder through the external control parts, and the piston moves up to drive the small valve plate to rise, which releases the axial constraint on the large valve plate, and the large valve plate opens under the effect of the inlet medium pressure.
When the inlet pressure disappears, the large valve plate will drop rapidly under the action of the medium pressure at the valve outlet end and the self weight to realize quick closing and intercept most of the fluid. At the same time, the pressure in the upper chamber of the piston cylinder pushes the piston down to realize the slow closing of the small valve plate. Because the external control circuit is equipped with regulating valve, the speed of piston moving up and down in the piston cylinder can be adjusted, so as to realize the regulation of the slow opening and closing process of the valve plate.
By changing the opening of the control valve in the external control module, the time of valve opening and closing can be adjusted. The filter has the function of reverse self cleaning, which greatly improves the reliability of the product and the service life of the product.

工作原理：

 

The work of the multi-function hydraulic valve is driven by the pressure water in the pipe network. It is controlled automatically by the pressure water and the pump, without manual intervention.

引用但不限于以下标准，未注日期的引用文件，其最新版本适用于本产品。

Standard name		Standard number
Integral steel pipe flange		GB/T 9113.1-9113.26-2010
Flanged metal valves	Flanged metal valves	GB/T 12221
General purpose valves	Pressure test	GB/T 13927
Dimensions of integral cast iron pipe flange		GB/T 17241.6
通用阀门	供货要求	GB/T 12252
BFDS型多功能水力控制阀（上欧阀门企业标准）		Q/QPJF001
阀门铸钢件	外观质量要求	JB/T 7927-1999
通用阀门	材料	JB/T 5300-2008
通用阀门	球墨铸铁瓶术条件	GB/T 12227
通用阀门	碳素钢铸瓶术条件	GB/T 12229

Serial number	name	texture of material	Serial number	name	name		texture of material
1	valve body	Cast iron, ductile iron and cast steel	6		Control chamber cover		Cast iron, ductile iron and cast steel
2	Valve shaft	Stainless steel	7		Control chamber base		Cast iron, ductile iron and cast steel
3	Large valve plate	cast steel	8		Bypass fitting		Stainless steel, copper pipe, RiFeng pipe
4	Small valve plate	Stainless steel	9		axle sleeve		Tin bronze   ZCuSnlOZn2
5	piston	Stainless steel	10		Sealing element		Nitrile rubberNBR

Nominal diameter（mm)	50-1000
Nominal pressure（MPa )	0.6、1.0、1.6、2.5、4.0、6.3
Leakage	Meet the requirements of GB / t13927
Minimum operating pressure	0.05MPa
Applicable temperature(。C)	0～80oC

1) It has many functions, such as light load pump start, cut-off check, elimination of water hammer and so on.
2) The valve can be equipped with opening indicator rod, and the stroke of piston cylinder can be controlled by adjusting the screw rod to realize the coarse flow regulation; and the travel switch or valve position indicator can be installed to output the switch signal or 4-20mA DC power for monitoring in the main control room (the company's patent).
3) The opening and closing of the valve is driven by the conveying medium and is automatically interlocked with the operation of the water pump. The valve of the pump is opened and the stop valve of the pump is closed. It is very convenient to operate the valve without personnel. It does not need external power and components, with less faults and less maintenance.
4) When the valve is fully open, its resistance coefficient is basically the same as that of Y-type stop valve, and the resistance loss is reduced by about 20% compared with similar products at home and abroad.
5) The filter in the external control channel has the function of self flushing, which can effectively adapt to the polluted medium and prolong the service life of the valve.
6) The drive and control parts are located outside the valve body, so the internal parts of the valve piston cylinder can be repaired online without stopping the pump.

Shape and installation of functional hydraulic control valve
Valves can be installed horizontally and vertically, and horizontal installation is preferred when space permits. In vertical installation, the medium flow direction should be upward. At the same time, in order to maintain the accuracy and flexibility of quick closing of large valve plate, counterweight and spring adding measures are allowed. Therefore, when using vertical installation, please specify in the supply requirements.