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Powder Coated Steel Diverter 2 Way Valve Pneumatic Conveying for Flour Mill

Pneumatic 2-Way Diverter (Plug Conversion Valve) Type THFX User's Manual 2004.8 1.Brief introduction Plug conversion valve (two-way valve) in series THFX is used to change the direction of stock flow in pneumatic conveying systems. It can change the direction of flowing stock in the pipe...

Pneumatic 2-Way Diverter
(Plug Conversion Valve)
Type THFX

User's Manual

2004.8

1.Brief introduction
Plug conversion valve (two-way valve) in series THFX is used to change the direction of stock flow in pneumatic conveying systems.
It can change the direction of flowing stock in the pipe without stopping the stock feed or air supply, and convey it to 2 destination choices. If several valves are used in group, the stock can be convenient. It is widely used to change the flow direction in positive or negative pressure conveying and low speed conveying pipelines of powdery or granular materials such as flour, bran, starch, grain, feedstuff, sugar, chemicals, plastics, etc, and can convey the stock to selected destinations. However, it is not suitable for highly sticky materials.


2.Specification & performance
2.1 List of performance data

Type

Nominal flux diameter (mm)

Pipeline crotch angle (degree)

Heat - resistant temperature (℃)

Work pressure of valve (KPa)

Cylinder

Suction conveying

Pressure conveying

Low speed conveying

Diameter / stroke (mm)

Work pressure (Mpa)

THFX6.5×2

65

50

100

50

10

400

50/100

0.4~0.6

THFX8×2

80

50/100

THFX10×2

100

63/100

THFX12×2

125

80/125

THFX15×2

150

100/125

THFX18×2

175

100/125

2.2 Overall dimension & erection size

Type

A

B

C

C1

D

D1

Dg

do

E

L

L1

L2

L3

M

φ

THFX6.5×2

100

80

88

154

78.5

157.5

65
68

73
76

138.5

92.5

20

330.5

572

M8

8

THFX8×2

115

100

97

163

87

175.5

80
86

89
95

154.4

105

20

318

572

M10

8

THFX10×2

140

120

107

170

94.5

197.5

100
106

108
114

174.7

120

20

314

585

M10

8

THFX12×2

170

140

127.5

193

109.5

230.5

120
125
130

130
133
140

205.4

140

20

378

698

M12

10

THFX15×2

210

160

141

217

124

265.5

150
158

159
168

237.2

160

22

368

713

M12

10

THFX18×2

240

180

152

228

135

290.5

170
180

180
190

260.8

175

22

353

713

M12

10


3.Structure & working principle
The structure is shown in the drawing. The valve body is the major part of the valve, there is a big hole in the center, 3 channels are opened on the wall of the hole and they connect to 1 feed pipe and 2 discharge pipes. The valve base is fixed on the base. The diameter of the valve core, also named as plug, is matched with the inner diameter of the valve body, and the 2 ends of the valve core are supported in the valve body by the bearings on the valve cover and sealed by triangular ring seal and "O" shape gasket, so the sealing is very good and reliable. It can satisfy heavy duty working conditions. On one end of the valve core, there is a wheel gear which is matched with the rack bar of the piston rod of the cylinder.

In the valve core, there is a radial passage connecting the feed pipe and the straight discharge pipe, while another angular discharge pipe remains in close state. At this time, the solenoid valve is power-off, and the piston of the cylinder is at the upper starting point; when the solenoid valve is power-on, the piston moves backward to the lower starting point, the rack bar drives the wheel gear and valve core to rotate, the position of passage is changed, the feed pipe is connected to the angular discharge pipe while the straight discharge pipe is closed. In this way, through the power-on and power-off of the solenoid valve, the action of the piston of the cylinder is changed and the direction of the stock flow is converted.

A stopper pin fixed on the wheel gear will contact with the two limit switches when it moves forward and backward with the gear, so the indicator light connected with the switches can indicate the flow direction of the stock. The limit screws adjusting the stroke of the cylinder have been checked in the factory, so generally they need no further adjustment before use.


4. Installation, adjustment and operation
Before installation and adjustment, it is advisable to read this instruction booklet carefully, and strictly follow all the instruction.

●  4.1 The valve can be directly put into use after delivered from the factory, however, it may subject to some adverse effects during transportation and long time storage. Therefore, first you should check to ensure that the type is right with your order, the parts are complete and there is no damage or impact mark, then wipe clean the outer and inner surface (soaking in water or oil is prohibited).take it to a source of air and power .let the angular discharge port facing up .and cushion the valve with flat wooden board . Connect the feed port of the solenoid vale to the air source with PU soft pipe , and connect the power supply cable to the two limit switches and the solenoid valve respectively. The indicator lights should also be connected into the circuits of the switches. When the air and power lines are well connected, first open the air supply, then switch on the power, watch if the indicator lights work properly. If all of the above work, you can begin the installation.

●  4.2 In order that the conversion valve installs and dismantles conveniently, it should be positioned according to the requirement of the process design. There are 4-M screw holes on the top of the conversion valve through which the valve can be fixed with bolts onto an installation support frame or iron board, and the frame or board should have been made at the installation site and fixed onto constructions of the factory. Attention should be paid at the stock flow direction: ordinarily, the cylinder side of the valve should connect to the feed pipe and the other two ports should connect to the discharge pipes; but if the process design asks for two feed pipes to enter into the conversion valve, then the feed pipe originally connecting to the cylinder side shall turn out to be the discharge pipe. The conversion valve can be fixed front-faced, i.e., 4-M screw holes on the lower side. It can also be fixed vertically, i.e. 4-M screw holes can be fixed in any direction of front, back, left, or right.

●  4.3 After positioning of the conversion valve, connect the feed and discharge pipes. Taking the thermal expansion factor into consideration, a gap of 2 mm should be left between the pipes and the plane of the 3 ports of the conversion valve. Spigot joints should be prepared with rubber gasket and flange specially made in our factory. After connection the pipes should be fixed onto constructions to avoid vibration.

●  4.4 For the convenience of defaulting and maintenance of the conversion valve, a check valve should be installed in the pipeline between the forced air and the cylinder of the solenoid valve, and a PU soft pipe is plugged directly into the joint of the air feed pipe of the solenoid valve. The air should be purified before entering the valve cylinder.

●  4.5 Connect the circuits of the indicator lights of stock flow direction and the on-and-off control circuit of the solenoid valve to the two limit switches and solenoid valve respectively. No foreign impurities should be allowed to drop into the conversion valve during the installation, including bolts, nuts, gaskets, snails, welting residues, metal chips, sands, fibers, wooden chips, etc. If any impurity drops in, it should be taken out immediately.

●  4.6 Re-check the reliability of the connection of all pipelines and circuits before starting the solenoid valve. First start the supply of forced air and then start the solenoid valve, watch if the running of the cylinder and solenoid valve is sensitive and reliable (the running speed of cylinder and solenoid can be adjusted by the soundproofing flow-controlling device located at both sides of air feed pipe of the solenoid valve, there is adjustable buffers at both sides of the cylinder), and see if the indicator lights work correctly. After all conditions are normal, feed a air source into the conveying pipe to make a zero-load conversion test; check if the location of the conversion valve is correct and if it is airproofing. After all of above works, a loaded running test may begin.

●  4.7 During the loaded running test, if stocks leak from the mouths of the feed and discharge pipes, tighten the bolts on the square flange. If stocks leak from one or two ends of the valve core, loosen the holding bolts from the adjusting nuts on the two ends, retreat the nuts by one or two circles, turn the four bolts inward by 15~200 angle on the side of the valve cover which is marked with an arrow, start the solenoid valve, turn the valve core back and forth by several times, if the leak still occurs, continue to turn the four bolts slightly inward until it is leak-free. Then turn the adjusting nuts on the two ends inward slightly until reaching the end face of the bearing, tighten the holding bolts again.

●  4.8 Notice for routine operation: because the high moisture content of the air flow in the conveying pipes could result in the rustiness of the valve body and the valve core, especially in the case of long time idling, the solenoid valve must be deliberately started by one or two times every shift to turn the valve core back and forth to prevent galling (except stainless steel.).


5. Troubleshooting & maintenance
●  5.1 If the equipment is not to be installed or used after dismantling for a long period, its inner and outer sides should be wiped clean and it should be stored in even, dry wooden case in well-ventilated and dry indoor places. It should not be stored outdoors for long time to avoid damages of bad weather.
●  5.2 If the piston of the cylinder does not move and the conversion valve does not convert after the power supply of the solenoid valve is switched on, it is mostly caused by the breakdown of the solenoid valve. Use the hand-gear on the solenoid valve to keep the valve core at the power-on position, so that the solenoid valve is maintained at power-on state and the piston will move to convert the valve. When finishing, reset the hand-gear, the conversion valve will reset to power-off state. This is only a temporary measure, the solenoid valve or coil must be renewed eventually.
●  5.3 The "O" shape ring seal on the ends of conversion valve will be aged, lose the flexibility and reduce the sealing effect after long-period storage or operation, so it should be dismantled and renewed. Dismantling order is as the following.
5.3.1 Dismantling: dismantle the aluminum support and wheel gear, loosen the adjusting nuts on the two ends, take out the valve covers and renew the ring seal.
5.3.2 Installation: clean all parts, first install the valve cover at the side of aluminum support, tighten the 4 bolts, make the cover close to the valve body. Then install the other cover, tighten the 4 bolts slightly. Put on the wheel gear and the aluminum support. Turn the valve core back and forth while turning the 4 bolts on the cover inward evenly until free of air and stock leakage (forced air in the cylinder during unloaded test is 1.2-1.8kg/cm2), finally turn the adjusting nuts of both ends inward until reaching the end face of the bearing, lock the holding bolts, and all work is finished and the valve can use again.

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Wuxi zhongda machinery Equipment Co., Ltd.
Add: Yangjian Town, Xishan District, Wuxi city, jiangsu, china
Contact: Mr.peng
Mobile: (+86) 15251501754
Tel: +86-510-510-88731537
Fax: +86-510-510-88340005
E-mail: wxzd@wxzd.com
Web: http://www.zdsheetmetalfab.com

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