In recent years, due to various factors such as environmental protection and rising international oil prices, various governments and auto companies have attached great importance to the development of new energy vehicles . The promotion and application of compressed natural gas (CNG) vehicles are generally considered to be energy-saving and emission-reducing and to reduce traffic pollution. A new approach has enormous potential for development and broad market prospects. Recently, the natural gas heavy truck designed and developed by SAIC Iveco Hongyan has passed the inspection in Chongqing.
The company's compressed natural gas (CNG) heavy trucks are mainly developed for the Thai export market, and take into account the domestic market demand for compressed natural gas as fuel. The complete vehicle optimization integrates key components such as mature engines and gas systems. Among them, the entire vehicle mainly uses D6114 series gas engine produced by Shanghai Diesel Engine Company, Fast 9JS series transmission , Steyr dual-stage deceleration welding bridge, Xindakang T8 cab (including left and right steering wheel models), etc. . The vehicle is also equipped with a newly developed vehicle compressed natural gas supply system. The system consists of gas cylinders, gas filling valves, etc., which are connected by a high-pressure steel pipe. Eight to twelve 80- or 120-liter gas cylinders can be installed according to user needs. In order to increase the cooling capacity of the engine, the vehicle also adopts a front-narrow, rear-narrow frame, and has made partial improvements to make the configuration shift smoothly, ensuring the safety of the cylinder and the reliable quality of the product.
As early as February 2007, the company carried out a 10,000-kilometer road test on the first prototypes. At present, the company has achieved the goal of mass production of natural gas heavy trucks.
After the company's natural gas heavy truck inspection at the meeting, the group of experts in the relevant technical reports listened carefully to the heavy truck natural gas company that SAIC Iveco Hongyan Hongyan company developed a compressed natural gas (CNG) heavy truck cars in line with the national energy saving Policy-oriented, to meet the national III emission standards, the use of advanced electronically controlled pressure regulators and gas vehicle EMS control technology, good dynamic performance, bearing capacity, a full and maximum mileage of more than 500 companies, reaching the leading domestic level. The project has reached the national export mechanical and electrical product research and development requirements, the implementation of the contract funds project specifications. Finally, the expert group unanimously agreed to pass the acceptance check.
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Air valve
The new double-canisters exhaust valve consists of a big canister and a small one.
When there is no water in the pipe, the canister in the body drops down to the full opening place. When water coming in, the air in the body is released from the big canister, then water can be filled into the pine immediately. When there is no air in the pipe, water comes into the valve cavity and causes the two canisters rise up to the closing place. And the big canister stays closed so as to improve the capacity of transporting water and to economize energy.Since air is often dissolved into water, when transporting water, the air is released from water continuously , however, when reaching the quantity, the small canister will drop down with a small amount of air released from air vents . Otherwise the air accumulating on the top of the pipe will reduce the pipe system`s capability of transporting water.
When there is negative pressure in the pipe, the big canister drops down and the discharge hole is open. Then the valve takes in air in good time so that it can avoid affecting normal water supply due to the negative pressure on the pipe.
1.Unique design:
The two canisters are made of non-toxic engineering plastics of high strength., with concise structure, light weight, reliable and stable exhausting.
Inside and outside surfaces of the body, cover and dust-prevented cap are all coated with epoxy resin powder with no iron exposed. Materials of inner components are made of stainless steel and engineering plastics so as to prevent corrosion and to ensure purity of media.
The sealed seat, made of bronze, improves the ability of anti-abrasion, and prolongs service life.
2.Excellent anti-corrosion:
Inside and outside surfaces of the body, cover and dust-prevented cap are all coated with epoxy resin powder with no iron exposed
3.Sanitary standard:
Non-toxic epoxy resin powder used comply with sanitary standard GB/T 17219-1998.The coated resin is in accordance with standards of drinking water.
4.Tested summary:
The media is air. In the procedure of the test, the air temperature shall keep between 5℃ and 45℃. The fluctuation of air flowing value shall be within 4% and that of the pressure value within 5% while that of air temperature value within 2%.
Sealing test at a low pressure. When the pressure goes up to 0.05 Mpa, 0.1 Mpa, 0.2 Mpa, 0.3 Mpa, 0.4 Mpa, 0.5 Mpa, the valve maintains the pressure at 12mins with no visually detectable leakage of the sealed surface.
Repeated test of exhausting Putting water into the valve and discharging air every 8-9 seconds. Then increasing the pressure to 1.6 Mpa , keeping it for 2mins before releasing. Conducting leakage test for 250 times with the result that there is no visually detectable leakage and no structural damage. Then testing the sealing at a high as well as low pressure, no visually detectable leakage.
Repeated test of airing Injecting air into the valve till the valve closes fully, then cutting off the air till the valve open fully. Repeating leakage tests for about 25000 times with the consequence of no visually detectable leakage and no structural damage. Then testing the sealing at a high as well as low pressure, no visually detectable leakage.
Test of the valve's endurance The valve is poured by water with a pressure of 1.6 Mpa at a temperature of 50℃and maintaining it for five days, then checking whether the valve can be normally opened or not after releasing the pressure.Testing the leakage, resulting in no visually detectable leakage and no structural damage. Then testing the sealing at a high as well as low pressure, no visually detectable leakage.
Air Valve,Exhaust Valve,Air Release Valve,Air Valve With Single Orifice
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