Pipe force valve is the latest pump outlet control valve developed by our company for five years. It is the third generation of new butterfly multi-function pump control valve after the old manual control valve, hydraulic control butterfly valve and hydraulic control valve. The valve adopts advanced fluid design, with low energy consumption, stable operation and good sealing effect. It has the functions of electric gate valve, electric butterfly valve and check valve. Its quick closing speed and adjustable pressure relief time can effectively eliminate the harm of water hammer and protect the safety of water pump and pipe network system. The valve is suitable for the outlet pipe of centrifugal pump, mixed flow pump and axial flow pump in automatic water supply and drainage pump station. Two control devices, diaphragm type and piston type, are designed, which can be respectively applied to clean water, raw water medium, sewage and slurry water medium. In terms of product types, five specifications are developed, including common type, low-pressure backwater type and sewage type, to meet the requirements of different working conditions.
The valve is compact in structure, small in size and light in weight. It is especially suitable for large diameter pipe network system. It can be widely used in power, environmental protection, metallurgy, petrochemical, water department, municipal, food and other industries, water supply and drainage system, sewage pump station, chemical fluid and other transportation systems.

Model example
Bfdg7m43hr-10c cast steel diaphragm sewage type flange connection pipe force valve bfdg7h42ahr-40c
 
Note: diaphragm structure is adopted for basic type; diaphragm structure is recommended for sewage type; piston structure is selected for regulating type.
 
Comparison table of commonly used valve body and valve plate materials

Material name	Material grade	Main media
	ANSI/ASTstandard		G B
carbon steel	WCB	ZG25	Main media
Ni Cr cast iron	\	QT400Ni2Cr	seawater
	CF8 (304)	ZGlCrl8Ni9TiZGlCrl8Nil2Mo2Ti	Corrosive media such as nitric acid
Cr Ni Mo stainless steel	CF8M (316)		Acetic acid corrosive medium
Cr Ni ultra low carbon stainless steel	CF3(304L)		Corrosive media such as nitric acid
Cr Ni Mo ultra low carbon stainless steel	CF3M(316L)		Acetic acid corrosive medium

 

The latest version of undated reference documents is applicable to this product.

Standard content	Standard number	Standard name
Enterprise standard	Q/OPJF007-2012	BFDGPipe force control valve
Design and manufacturing standards	GB/T12236	Butterfly Check Valve
	API6D	Butterfly check valve with damping
	GB/T13927-2008	Pressure test for general purpose valves
Flange standard	GB9113.1-9113.4	Integral steel flange / customer specified standard
Structural length standard	GB/T12221	Metal valve structure length
Standard of materials used	GB/T12229	Technical specification of carbon steel castings for general purpose valves
	GB/T12230	Technical specification of austenitic copper castings for general purpose valves

project		caliber
		< 1000mm	≥1000mm
Valve closing time（s)	fast	1~2.5	1〜5
	slow	3〜60	5-90
（Mpa)		=0.05
resistance coefficient		0.3〜1.1
Valve opening time		10-60
Water hammer peak		S 1.5Double the rated pressure of water pump outlet
Maximum reverse speed of water pump		S 1.2Double the rated speed of water pump
Adaptive temperature		Not indicated as 0-80 ° C, can produce - 25 ° C-200 ° C

1. Various functions: it has the functions of closure check, light load pump starting, eliminating water hammer, etc., and one valve with multiple valves can save the total investment of equipment.  
2. Slowly open the pump: after starting the pump, under the action of the microporous check valve at the inlet end, the valve can only be opened after reaching a constant pressure, which can reduce the pump starting current and ensure the safety of the motor and electric control system.  
3. Quick closing and slow closing: unique small valve plate structure (patent of our company 200720064765.7 "slow closing structure of small valve plate of pipe force control valve"), when stopping the pump, fast closing and then slow closing can effectively eliminate water hammer and ensure system safety.  
4. Beautiful appearance: the innovative design of control device is adopted in the structure, with small external space, simple internal structure and strong operation reliability. In terms of technology, the shell and parts are precision casting, with good structural strength and simple and exquisite appearance.  
5. Easy to install: butterfly valve structure, small size, light weight, small space, reduce the cost of civil engineering, can be applied to various installation methods such as surface and trench.  
6. Simple maintenance: the opening and closing of the valve is driven by the conveying medium, which is automatically interlocked with the water pump, without manual and external force operation; there is no external power and components, and the integrated structure has less fault points; the parts and components in the hydraulic cylinder can be overhauled at the same time of the normal operation of the unit; the key parts are made of high-quality materials, basically without maintenance; The filter in the external control channel has the function of self washing
7. Energy saving and consumption reduction: the opening and closing parts are inclined butterfly plate, the water flow is smooth, and the loss along the way and local loss is very small; cancel the electro-hydraulic control system of hydraulic butterfly valve, reduce the cost, increase the reliability and stability, reduce the power consumption, and achieve the purpose of energy saving.  
8. Reliable operation and sealing: it adopts the soft and hard double sealing structure (the patent of zl01249431.3 "soft and hard combined sealing device for valve opening and closing parts") or metal hard sealing structure,
The friction moment of the sealing pair is very small; the oblique eccentric structure seal pair shortens the valve closing stroke, reduces the slip distance of the seal ring, reduces the friction torque, achieves the effect of instantaneous clutch, and has the function of anti sediment and automatic pressure compensation; the optimized design of the sealing angle of the valve body and valve plate makes the valve opening and closing flexible and reliable.  
9. Strong adaptability: the products are diaphragm type and piston type, which are suitable for various working conditions and media. The special filter in the external control unit can effectively filter the impurity particles in the sewage, and ensure that the medium entering the diaphragm cavity or piston cylinder is clean liquid. The filter device has the function of self washing, and the bypass inlet end is equipped with a slag discharge device, which can manually and regularly discharge slag. The adjustable type can adjust the flow rate by manual or electric control according to the working conditions.

Action principle
1. Valve opening: the initial state is shown in (1). When the water pump is started, the water pressure enters the lower chamber of the control chamber through the bypass pipe with micro hole check valve at the inlet. The large valve plate is slowly opened together with the small valve plate under the hydraulic action of the inlet end, as shown in Fig. (2). The valve opening speed can be set according to the requirements of working conditions by adjusting the opening of the ball valve to achieve the best effect.  
2. Valve closing: at the moment of pump stop, the flow and pressure at the valve inlet suddenly decrease, the large valve plate closes rapidly under the action of gravity (before the valve plate contacts the valve seat, a buffer mechanism is set to protect the sealing surface), and most of the water flow is cut off. The small valve plate automatically opens under the action of the control chamber to discharge the backflow pressure water and reduce the peak value of water hammer, as shown in Fig. (3); At the same time, a part of the return water flows into the upper chamber of the control chamber through the bypass pipe, pushes the control rod downward, and closes the small valve plate until the medium is completely cut off, as shown in Fig. (4). The valve closing time can be adjusted by the regulating valve on the bypass pipe to make the water hammer peak within the control range.

 

Type of this product range
1、BFDG7m/h4 
1. The general company supplies diaphragm type. The common type is suitable for pipe network system with backwater pressure greater than o.impa
2. Bfdg7h42 regulating type (a manual, B electric) on the basis of the common type, by installing the regulating device on the control chamber, the valve opening can be adjusted manually or electrically according to the system requirements, so as to achieve the coarse regulation and control of the medium flow in the pipe network. The conventional supply of electric equipment is ordinary type, with special requirements, which can be configured according to user requirements.  
3. Bfdg 7m4.3 sewage type is suitable for conveying sewage and slurry water. The diaphragm structure has low sensitivity to the slag content of granular sewage. At the same time, the special filter in the external control module can effectively filter the sewage The impurity particles in the water ensure that the medium entering the control chamber is clean liquid. At the same time, the filtering device has the function of self washing. The lower part of the filter device is equipped with a slag discharge device, which can discharge slag manually and regularly. The system is also equipped with a cleaning device.

Figure 2 product types
4. Bfdg 7m / h 44 backwater low pressure type is recommended when the return water pressure of pipe network system is lower than o.lmpa. The valve is equipped with auxiliary valve closing mechanism.  
5. The working principle of bfdg 7m / h 4.5 signal output type pipe force valve is the same as that of ordinary type. On the basis of the valve, a travel switch is added to directly express three kinds of signals: full open, full close and fault. The opening and closing conditions of the valve can be observed locally or remotely. The device has simple structure and convenient operation and maintenance.  
6. Bfdg 7m / h 4.6 axial flow pump is designed for the working characteristics of axial flow pump. By adding control components, the valve can realize the function of light load pump starting by opening the valve first and then starting the pump. When the pump is stopped, the valve will automatically close quickly and then slowly to eliminate the valve closing water hammer.  
7. The bfdg 7m / h 47 antifreeze type is suitable for the northern and other cold climate areas. The control part of the antifreeze type pipe force valve adopts heat preservation structure. Through heat exchange, auxiliary heating and other forms, it can be applied to the harsh working condition of - 20 ℃.

name

Common material	Chromium nickel stainless steel	Seawater resistant material
Valve shaft	Stainless steel2Crl3	ZGlCrl8Ni9Ti	316L
Diaphragm / piston	NBR / stainless steel	EPDM/2Crl3	EPDM/316L
Sealing surface of valve body		ZGlCrl8Ni9Ti	ZcuZn38Mn2Pb2  Manganese brass（T)
Hard seal pair	D507(H)+A102(R)	316L+316L	T+316L

1. The pipe force valve can be installed horizontally and vertically (the medium flow direction is upward). The top rod side of the control cylinder is the outlet direction. Reverse installation is strictly prohibited. The valve shaft must be in the horizontal position.
2. In order to facilitate installation and maintenance, horizontal installation should be given priority when space permits.
3. When the valve diameter is greater than or equal to 900mm, support or foundation can be set to improve the stress condition of pipeline.   
When installing butterfly valve behind 4 valve, the installation distance is usually 1DN. Please contact the company's technical department for more detailed installation dimensions before and after the valve of each caliber.

Main valve structure		Control cavity form	Position of control chamber	Operating mode of valve plate	Sealing form	Pressure relief form
Swing check valve	Butterfly or swing structure	Slow closing piston cylinder	In flow channel or one side of valve body	Swing structure	The cast iron surface is lined with rubber, It is in the form of soft sealing	There is no drain hole, and the discharge depends on the buffer piston (slow closing adjustment is poor, easy to damage, easy to generate noise, unable to eliminate the hidden danger of water hammer)
Lifting return valve	Cut off structure	nothing	nothing	Lift type operation, when closing the valve, the The valve seat has a large impact。	There are soft seal and hard Two forms of sealing structure	No slow opening and closing function
Pipe force valve	Butterfly structure	Piston type, diaphragm type	Overhead	Screw in structure and large valve The plate is equipped with buffer device to close the valve Silent sound	Hard and soft double seal	Fast closing of large valve plate, slow closing of small valve plate and two-stage closing of valve

comparative analysis

Butterfly structure is small in size, Light weight, in resources The trend of increasing tension Next, butterfly style is the mainstream hair Exhibition form.

The pipe force valve is realized through the control chamber Slow opening and closing function. also A variety of control cavity forms are available According to different working conditions, medium and pressure power.

Pipe force valve overhead control chamber The structure does not occupy the channel space The resistance coefficient is small, And convenient for maintenance and safety Can be installed on the ground Surface, trench, etc., none The original civil works need to be changed Facilities.

The moment of inertia of tube force valve plate is small, The valve plate is flexible and inclined at the same time The valve seat structure can be reduced properly The valve closing stroke improves the valve Action reliability。

Hard and soft double sealing surface, The combination of hard sealing structure is strong High strength, wear resistance, wear resistance Impact and soft seal seals It has the advantages of good performance Effective solution to the valve tightness Sealing problem can ensure the valve Long term "zero leakage" of door

The large valve plate is hung independently, and The large valve plate is provided with a drain hole, Make sure the pump is stopped under any condition Now the large valve plate is closed to prevent water pump High speed reversal and its discharge hole Dynamic pressure relief to prevent water hammer accidents happen.