Identification method of pneumatic ball valve material The material of pneumatic ball valve can be concluded only after the following tests. Generally speaking, there are extinguishing method, hot air aging test, specific gravity measurement, and low-temperature method to test its material. First, take samples from waste pneumatic ball valves, soak them in one or several selected media, weigh them after a certain temperature and time, and infer the type of data according to the change rate of weight and hardness.
For example, after soaking in 100 degree engine oil for 24 hours, the quality and hardness change rate of NBR, fluororubber, ECO and CR are very small, while the weight of NR, EPDM and SBR is more than doubled, the hardness changes greatly, and the volume shrinkage is very obvious. Extinguishing method: take a few samples and burn them in air. Look at the phenomenon. Generally speaking, fluorogel, CR, and CSM are self extinguishing when they are out of fire. Even if the flame is ignited, it is much smaller than that of ordinary NR and EPDM. Of course, the off state, color and breath will also provide us with a lot of information. For example, when NBR/PVC adhesive is used, when there is an ignition source, the fire will sputter, as if there is water, it will extinguish itself when it is away from the fire, and the smoke is thick and sour. It should be noted that sometimes the adhesive added with flame retardant but without halogen will extinguish from the fire, which should be further inferred by other methods. Hot air aging test: take samples from waste products and put them in the aging box for aging for one day to see the phenomenon after aging.
Gradual aging can gradually increase the temperature. For example, CR, NR and SBR will be brittle at 150 ° C, and NBR EPDM will be elastic. When it rises to 180 degrees, ordinary NBR will be brittle; The HNBR will also be brittle at 230 degrees, and the fluorine glue and silica gel still have good elasticity. Measuring specific gravity: use an electronic scale or analytical balance, accurate to 0.01g, plus a glass of water, a hair can be. Generally speaking, the proportion of fluorine glue is the largest, more than 1.8, and the proportion of CR ECO is also more than 1.3. It can be considered that these glue are the ones whose proportion is obviously too large. Low temperature method: take samples from waste products and use dry ice and alcohol to create a suitable low temperature environment. Soak the sample in a low temperature environment for 2-5 minutes, and feel the soft and hard level at the selected temperature. For example, at - 40 ℃, silica gel is relatively soft compared with fluorine gel, which is also good at high temperature and oil resistance. Gongyi Yuanda Water Supply Materials Co., Ltd. is a professional manufacturer engaged in the research, development and production of water supply and drainage equipment, with strong technical force, superior product quality and timely supply. The main products are: waterproof casing, pneumatic ball valve, pneumatic valve, power transmission joint, duckbill valve, expansion device, pneumatic valve and other series products. Tel: 18521350330, welcome new and old customers to inquire and order!