Abstract: This paper introduces the GH-700 technical parameters, structural performance type manifold and the main components of the device. Fracturing Manifold is important fracturing equipment. In the past there is no fixed factory mass production of such a product, oil fields have made use of some devices fracturing process, the structure is not the same, in order to meet the needs of rapid development of the oil industry to accelerate the pace of construction of socialism, for the realization of our beloved 2000 to achieve the grand goal of the four modernizations in the fourth National People's Congress, Premier Zhou Enlai proposed in the government work report; to support the world revolution, I plant 47 years bear Fracturing Manifold 70 type of test production tasks (Jianghan Petroleum Administration drilling equipment Design Institute), in December 1975 the trial out of two, went to the Shengli Oilfield and Dagang Oilfield industrial test carried out in the experiments were done fracturing and sand control construction. The main fracturing fluid as water, oil, sesbania like. A total pressure of the four wells, five wells. Maximum pressure 320 kg / cm, also made ground twice dynamic pressure test, maximum pressure 640 kg / cm, which lasted 24 minutes, 20 cubic meters to fetch water. Designed, manufactured using three units together to do the identification, approval petrochemical unit manufacturing group, which is now a small batch production.
A, GH-700 type manifold technical parameters: manifold structure shown in Figure 1

1 GH-700 type manifold structure diagram
1- 2 "High Pressure Hammer Union; 2- Check valve; 3-φ45 × 700 atm Hammer Uniom; 4- Plug valve; 5- Vent valve.
1. For the fracturing -700 kg / cm or less;
2. Maximum operating pressure: 700 kg / cm;
3. Seal test pressure: 800 kg / cm;
The strength test pressure: 1000 kg / cm;
5. The pipeline diameter: φ54;
6 pipeline diameter: φ64.
Two, GH-700 type manifold structure and use
Mainly by Check valve 2, Plug valve 4, Vent valve 5 and Hammer Uniom, Tee, Cross Tee, Pup joint and other components. A total of 14 connectors, which are equipped with Check valve 10 connectors can be connected to each 10 Fracturing Truck. Vent valve equipped with a vent line connected to the connector. A connector mounted on the Plug valve Check valve after the branch line can be connected to balance the car, fracturing wellhead connector and two main line connection. Manifold middle are two main line, center distance of 779.5 mm, composed of manifold truck can be fixed on the CA -10 (or -30 CA) type of liberation car beams, branch pipeline ends equipped with 2 "Hammer Union, can directly connected with the SYC-700 and YLC-500 type Fracturing Truck.
Third, the main components Manifold
1, Check valve: structure shown in Figure 2

Figure 2 Check valve
1- gland; 2 - spring; 3 - Seoul where the assembly; 4- Seoul where the seat; 5- body.
Manufacturing is characterized by relatively simple, easy maintenance. Seoul where its assembly and AC-700 Fracturing Truck of Seoul where the assembly is similar, safe and reliable, less prone to sand cards. Check valve role in the fracturing process, when Fracturing Truck needs to stop to repair a fault when, Check valve at a pressure differential, can automatically cut off the pipeline of high pressure liquid stream for repair and fracturing as usual get on.
2, Plug valve: structure shown in Figure 3

Figure 3 Plug valve
1- runner; 2 - cock; 3- 4- valve body; 5- Gland
A pair of valve 4, through an adjustable gap gland valves, valve and cocks among the three, so that both the seal between the valve cock 2 and 3, the switching time and lighter. Valve chamber filled with high pressure seal grease, to improve the sealing and lubricating properties. This feature of the valve is easy accessibility, switch rapidly, and its role is to change the direction of flow. Deficiencies are difficult to rotate with pressure. Plug valve body main components namely, taps and valves three.
① Body: Material 35CrMo steel quenching HB204-280 start when the cone (1: 7). Take grinding process, due to the alignment error, resulting in different hole straight tapered bore and upper and lower ends of the heart, just hit the pressure test 50 kg / cm, then we take each hole finishing process, both sides of the hole roughing the opposite is not drilled through in order to ensure the quality of the cone, and after finishing this trial process is still relatively good.
② valve: In the trial we encounter the following two issues:
A. Material issues: the design is seeking ductile iron, cast us a bad start, it changed to ordinary cast iron, the results of the test pressure to 50 kg / cm on the broken valve, three-day test were the case, then instead of ductile iron was successful, indicating that the valve material is not ordinary cast iron.
B. valve seal groove processing: we consider the depth of machined circular groove on an equal cone is difficult, so we made a frock, also approximate the circular groove is formed by the movement and rotation of completed. Legislation on the use of this tooling milling, the tooling is fixed bench milling, vertical milling head and then move turn at an angle so that it is parallel to the workpiece (ie, consistent with two angles) shown in Figure 4, the vertical milling spindle is equipped cutter, cutter requirement is for the tool position on the cutterhead rotation should guarantee that the required diameter of the workpiece groove diameter.

Figure 4 circular groove milling jig schematic
1- piece, 2 cutter, 3 bearing, 4-bearing frame, 5 fixture axis; bearing 6-, 7-, rack gear 8, 9 - rack shelf, 10 small apron, 11 nuts, 12 - screw, 13-handle.
Tooling works: turn the handle 13 by the screw 12, driven by a nut 11 small slide plate 10, a small slide plate fixed bearing seat 4, there are two bearings 3 and 6, bearing built with jig shaft 5 axis the right side holds the workpiece 1, the left end of the shaft mounted gear 8, gear and engaging a fixed rack 7, when the workpiece is moved forward at the same time around the fixture after the axial direction (the opposite direction) is rotated to seal milled grooves.
Design principle: we are considering this, to seal milled grooves must be made by moving and rotating (and moving in the opposite direction) to complete the two sports. After analysis, the gears should move a distance equal to the diameter of the cutter, taking into account tooling and the workpiece gear is mounted on the same shaft, turned the angle should be equal, so the gear is turned a section arc length cutter diameter, see Figure 5.

Figure 5 O-ring seal groove formed schematic
3. Vent valve: reliable, easier processing, switching effort under high pressure relief valve Vent valve suitable for the role in the fracturing process needed after fracturing completion reverse circulation wellhead gate can be shut down or, again open Vent valve, so that the ground lines relief, then switchover good Plug valve, then, to open a total gate were reverse circulation. Structure shown in Figure 6.

Figure 6 Vent valve
1- gland, 2-valve, 3 where Dole, 4 where Dole seat, 5-pressure cap, 6- stem.
Currently we have 700 manifold understanding is still very inadequate, yet to be tested in the future will continue to improve with the continuous improvement.