Production of HPH.

HPH (high pressure hoses) - hydraulic usually not reinforced, high pressure hoses. Sleeves reinforced with several layers of cross / spiral brass (steel) braid for high tensile strength. HPH is used in many types of systems in the art as a flexible pipeline. High pressure hoses used to transfer oil to the nodes of aggregates of liquid fuels, various types of emulsions and fats for lubrication in a temperature range (from - 40 to + 125 degrees). The Russian market is filled with hydraulic arms of domestic and foreign manufacturers, different in purpose and specifications.
All this variety of settings and types of HPH is regulated by European and Russian standards.

The standards governing the production of HPH.

High pressure hoses conventionally divided into two groups: with metal hoses and winding hoses with metal braids. Conventionally, because the West and the domestic industry also produces highly specialized hoses (rubber layer of large thickness, with a textile braid, and so on. P.), Which have almost no influence on the market of industrial rubber goods as a result of small production volumes.
In the manufacture of hydraulic hoses domestic manufacturers adhere to the provisions of the TU 38105147 - 95 (as well as GOCT 6286 - 73, TU 38305143 - 00, etc.), And GOST 25452 - 90. In accordance with GOST 6286 - 73 sleeve can be made of two types: two and one brass wire braid (type 1) and mixed wire (type 2). Each type for breaking strength is divided into groups: A - not less than 15 kg, Z - no less than 20 kg, B - not less than 17.5 kg, with a stock rupture pressure 3P for groups A and B, and 4P to the group Z. RVD these types are able to operate in the range -50 to +70 degrees.
GOCT 25452 - 90 regulates coiling HPH pairs with four multidirectional winding layers and intermediate layers between pairs of rubber. The sleeves are capable of operating at high load and an internal pressure of 50 MPa.
Production of foreign HPH, a braid of metal, since 1997 regulated standards UOM UOM 853 and 857. According to the documents hoses with metal braid working temperature from -40 to 100 degrees, transporting glycols, fuel mixtures, mineral oils and temperatures from - 40 to 70 degrees during transportation buttered emulsions and water. The standard provides 4 types of manufacturers of high pressure hoses: 1ST and 2ST similar to 1SN, RVD GOST 6286 - 73, 2SN, different types of 1ST and 2ST rubber outer layer with a smaller thickness. The main difference between foreign-sleeved high-pressure hydraulic hoses and domestic is in different conditions of passage of hydraulic hoses that are similar in external parameters.
Hydraulic hoses with metal winding regulated by EN 856 and made of 4 types:
1. 4SR (running at an average level of pressure and have a spiral layer 4);
2. 4SN (for high blood pressure and have a 4 wire winding layer);
3. R12 (winding layer 4 are applied with high temperature and medium pressure);
4. 6-coiling and more R13 (use under extreme conditions).

Typical HPH design.

Construction of high pressure hoses: hose have two layers - external and internal. The layers are made mainly of rubber. For the inner layer of rubber from used oil-resistant synthetics. Western manufacturers are making the inner layer of nitrile, which extends the possibility of using a sleeve. Yes, the outer layer using durable, indelible, rubber. To improve the heat resistance of the hose, cover the wound rubber or corrugation. Braided hoses are made of layers of steel wire. Winding, according to GOST 25452 - 90 EN 856 made of steel wire in the layer 4 or more pairs navivaya layers with different directions and between pairs of intermediate layers of rubber. Hoses are supplied in coils in the enterprise, where then cut to length on request.

The use of hydraulic hoses.

The modern equipment and modern technology used in most hydraulic systems that can not do without RVD. Hydraulic Hoses of high pressure applied on almost all models of tractors (Kirovets, DT, Amkodor, CTZ, Belarus, and so on.) Harvesters (MZKT, Gomselmash, Acros, Niva, Don and OE), tractors, trucks, trucks (KAMAZ, BelAZ, MAZ, KrAZ, ZIL, GAZ).
Imported equipment is in their transmissions (steering and braking systems, driving the transmission, control and power transmission, etc..) Foreign manufacturers of high-pressure hoses (Renault, MAN, Mercedes, Scania, Volvo and others). You can also add other hydraulic forklift system, graders, etc. Hydraulics is a cost-effective and the best solution to many problems in the art. An important component of HPH a hydraulic valve.

The process of installing fittings on HPH.

The durability and reliability of operation of the high-pressure hose is determined crimp couplings and fittings, which are reinforced with a sleeve. The ability to operate hoses and safety of the people who operate the equipment with hydraulic systems, depends on the proper selection of the fitting.
Fittings are put in places RVD connections, branches, junctions, bends, etc. There are three types of fittings:.. Interlock, universal shank, SC series. Fittings can be inch and metric threads and compacted by the conical thread, cone, sealing rings, gaskets, bolts and spherical surface.
Technology crimp fittings is based on the creation of a sealed hose connection. With this change the mechanical properties of rubber, and formed a strong bond. All this provides a greater tightness, tensile strength and reinforcement sleeve problem areas.
To apply crimp to crimp press with fists the size of fittings (FP20 / 165, P20 / 51, SP350 / 1200, MS, IS, CS, HP, and so on. D.). Press distinguished by crimped hose diameters, the degree of compression, the force on the compression performance. The diameter after crimping is carried out on the tables for each piece of equipment.
Crimping process takes place in two stages. Initially, the equipment installed crimping jaws that match the size of the fitting. Using the vernier is set according to the diameter of the crimping press table. Prepare a couple and clutch wear on the hose to get rid of poor-quality connection. The fitting sleeve is inserted, and the compound is placed in the jaws. With the help of the lever gradually increase the pressure, gradually leading to a settlement. Poluseriynye and serial media alert about the crimp termination. After the operator carries crimping control with feeler. The probe is part of the fitting at the correct pressure testing up to the middle of a thick end. If the probe comes completely, the operator starts to control the process by reducing the diameter of the compound. After oppresovki sleeves, a special booth, checked the quality of the connection in the dynamic and static mode.

Proper use of the WFD.

Compatibility with the medium - of great importance for the long work of the WFD. All the high-pressure hose elements must be compatible with the medium. This is due to the fact that any damage caused by a chemical reaction, will inevitably lead to failure of the WFD and of the equipment.
It is necessary to adhere to the temperature recommended by the manufacturer. Work sleeves should not be held at pridelnyh conditions. Sealing Fittings and condition of the elastomer is dependent on the time of the WFD and extreme temperature operation.
The durability of high pressure hoses depends on the allowable pressure. Note that when using a sleeve with a diameter less than the bandwidth necessary for the transported medium gives rise to turbulence, which results in increased pressure and increased temperature. Pressures can vary from the recommended pressure only when the pulse spikes. The hydraulic system, using electronic measuring systems, it is necessary to test for pulse loads. The sleeves should be selected according to the obtained values as a result of testing.
Of great importance for the durability and reliability of the hose connections is the right choice of the permissible bending radius and length. To exclude the possibility of tension necessary to provide slack in the sleeve. Under conditions when RVD bend more than the allowable value, decreases sharply limit its tensile strength and can break.
It is important to follow the outer layer of the WFD. Sleeve contact with moving parts, despite the resistance of the rubber layer on the outer lead to wear. The outer shell is not infinitely resistant to external factors and increased temperatures. At the risk of hose should be protected temperaturastoykoy shell.
The criteria for determining the choice of the WFD
Hydraulic hoses have large operational capabilities. Choosing RVD better analyze the following technical parameters for the hydraulic system:
1. Resistance components of the fluid to the RVD.
2. Thermal resistance of both external and internal rubber layer of high-pressure hoses.
3. The limits of the working pressure.
4. The bending radius.
5. The value of pulse pressure and external load on the high-pressure hose.
6. Reliability seal forms.
7. The quality of molding and fittings.

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