4 Material mechanical property test
4.1 Test material The material used for the test, that is, the composite thick plate, is made of continuous glass fiber reinforced vinyl resin. The fiber structure and molding process are consistent with the continuous fiber reinforced structure and molding process conditions used for the production of the new FRP pneumatic ball valve, and the fiber content is also the same. In order to facilitate the test to determine the properties of composite materials under out of plane (interlaminar) loading conditions, the thickness of raw material plate is 60mm.
4.2 During the test, according to the size of the test sample required by the standard, a group of 5 samples were made. Fix the sample on the CSS electronic universal testing machine and work together with the load sensor, controller, power amplifier and computer. Cut 5 samples along the in-plane and out of plane directions, 10 samples in total. The test was conducted at 25 ℃, and each group of tests was repeated five times.

Manufacturing process:
1. Mix the inner layer rubber, middle layer rubber and outer layer rubber with a mixer according to the formula; Extrude the inner oil pipe with an extruder and wrap it on the soft core or hard core coated with mold release agent (the pipe core can also be omitted for liquid nitrogen freezing method).
2. The calender presses the middle glue sheet, adds the release agent to roll it up, and cuts it into regular width according to the process request.
3. Wind or weave copper plated steel wire or copper plated steel wire rope on the winding machine or braiding machine for the oil pipe containing the inner layer of the pipe core. At the same time, synchronously wind the middle layer of glue sheet between every two layers of copper plated steel wire or copper plated steel wire rope on the winding machine or braiding machine, and bind the beginning and end of the winding steel wire (some early winding machines need to stop the pre-stressed shaping of the copper plated steel wire in advance).
4. Wrap the outer layer of rubber on the extruder again, and then wrap the lead or cloth curing maintenance layer.
5. Vulcanized by vulcanizing tank or salt bath.
6. Finally, remove the curing maintenance layer, pull out the pipe core, buckle the pipe joint, and conduct sampling and pressure inspection.
In a word, there are many equipment, varieties of raw materials and complex consumption processes for manufacturing high-pressure oil pipes. However, in recent years, the consumption process of hydraulic tubing with plastic or thermoplastic elastomer as the main raw material can be properly simplified, but the raw material price is high, and rubber is still the main raw material. Key words of this article: pneumatic butterfly valve, high-pressure hose, large diameter hose, stainless steel pneumatic butterfly valve Songxia tells you how to distinguish the specifications of high-pressure hose