Application of TPU in sealing ring PU Seals,Kvk Lip Seals,Kvk Uhp Industrial Seals,Polyurethane Material,Seal ZXS SEALING PRODUCTS FACTORY , https://www.zxs-seal.com
The sealing ring is an annular cover consisting of one or more parts, fixed on one ring of the shaft and bearing, in contact with another ring or washer, or forming a narrow labyrinth gap to isolate oil and gas, prevent Oil spills or passes through, preventing the intrusion of foreign objects. At the same time, it can also bear pressure, and has the dual functions of pressure bearing and sealing within a certain range.
1. The sealing ring should have good sealing performance within the working pressure and a certain temperature range. The sealing ring made of TPU material can automatically improve the sealing performance with the increase of pressure.
2. The friction between the TPU sealing ring device and the moving parts should be small, and the friction coefficient should be stable.
3. TPU material sealing ring has strong corrosion resistance, not easy to age, long service life, good wear resistance, and can be automatically compensated to a certain extent after wear.
4. The structure is simple, the use and maintenance are convenient, and the service life of the sealing ring is longer.
Type of seal
For sealing pistons in reciprocating hydraulic cylinders.
Axial seals are used to prevent internal grease or oil from leaking out, and also to prevent the intrusion of external splashing water or dust.
Used in the manufacture of reciprocating seals in hydraulic systems of construction machinery,
Static and reciprocating seals for rotary motion.
Protection seals for hydraulic oil, emulsion and water mixtures
Sealing rings for hydropneumatic systems in liquid and gaseous working media such as air, water, oil, etc.
Dust seal ring for oil cylinder, mechanical oil cylinder piston rod or valve stem under severe working conditions of -40℃~+120℃
When the working temperature is -100℃~+200℃ and the cylinder pressure is greater than 10MPa, it is used as a retaining ring for the sealing ring.
It is used for sealing of various process pipelines such as petroleum, chemical industry, metallurgy, papermaking, sewage, seawater desalination, food brewing, beverage processing, medicine and so on.
In addition to the general requirements for TPU sealing ring materials, the sealing ring should also pay attention to the following conditions: (1) elasticity and elasticity; (2) appropriate mechanical strength, including expansion strength, elongation, tear strength, etc. (3) The performance is stable, it is not easy to expand, and the thermal shrinkage effect is small (Joule effect). (4) It is easy to process and form, and can keep precise dimensions. (5) Do not corrode the contact surface or pollute the medium. The most suitable and common material to meet the above requirements is rubber, so most sealing rings are made of rubber or TPU material. There are many kinds of rubber. Differences in materials such as silicone, TPU, TPE, TPEE, etc. will also determine the sealing effect of the sealing ring. The reason for choosing TPU as the sealing ring is that TPU has a certain rebound effect, oil resistance, acid and alkali resistance, performance is better than other materials, and the use time is longer.
RMB FDI is expected to be officially stipulated this fall.
A person familiar with the matter said that the “RMB FDI†, which is expected to attract the attention of the central bank in the past two months , has already entered the countdown. The "First Financial Daily" reporter recently learned from a person familiar with the matter that the central bank's pilot management measures for foreign direct investment (FDI) RMB settlement "is expected to be introduced in the past one or two months." Renminbi FDI is “ready to go†The above-mentioned insiders told this reporter that before the RMB direct investment and shareholder loans were done on a case-by-case basis, “the central bank is expected to introduce the RMB FDI pilot management method in the past two months, and will not continue thereafter. There is a concept of 'cases'," the person said. “The formal regulations of the central bank on RMB FDI will be launched at the end of October and the latest will be at the end of the year.†The relevant person in charge of the international business department of a large state-owned bank Shanghai Branch also confirmed to the reporter, “It is worth noting that the current central bank’s case for RMB FDI The approval has been suspended.†In June this year, the central bank issued a notice (Yinfa [2011] No. 145) (hereinafter referred to as “No. 145â€), which publicly defined the RMB FDI pilot scheme for the first time, indicating that foreign-invested enterprises can apply for The renminbi legally obtained abroad will come to China for direct investment. Circular 145 stipulates that the domestic settlement business of a foreign investor or a domestic foreign-invested enterprise must pass the approval document or approval certificate of the local competent commercial authority, and then submit it in writing to the branch office of the sub-provincial city center branch of the local central bank. The central bank's head office approved. "But in the end, the number of cases approved by the central bank's head office is actually not much. The entire process takes at least four months." The relevant person in charge of the international business department of the state-owned big bank said, "Now, due to the RMB FDI related measures. Coming soon, the central bank's head office and local branches have basically suspended the cases reported by the banks. I believe that the new regulations in the future will make the process more streamlined." The Ministry of Commerce announced on August 22 that the Ministry of Commerce is directly related to cross-border RMB. Notice on Investment Related Issues (Draft for Comment) (hereinafter referred to as “Noticeâ€), the deadline for comments is August 31, 2011. Shen Danyang, spokesman of the Ministry of Commerce, also said at the regular meeting of the Ministry of Commerce held on August 24 that the "Notice" is going to be implemented in September. The Notice stipulates that cross-border RMB direct investment shall not be used directly or indirectly in investing in securities and financial derivatives in China, and in entrusting loans or repaying domestic and foreign loans; and for cross-border RMB direct investment in real estate, It shall be implemented in accordance with the current regulations on the approval and filing of foreign investment real estate. "Actually, from the "Notice" of the Ministry of Commerce, the use of RMB FDI is more stringent than that of foreign currency FDI." The above bankers told this reporter, "For example, foreign currency FDI can be used to return domestic and foreign loans, while the RMB FDI is not allowed, indicating that the regulator is still very cautious about RMB capital.†The bank also estimates that the official “Notice†of the Ministry of Commerce is likely to be earlier than the introduction of relevant central bank management measures. “Enterprises need to meet the Ministry of Commerce at the same time. And the regulations of the central bank, of course, it is expected that the central bank may be similar to the Ministry of Commerce, giving local branches certain approval and decentralization within a certain limit," the person said. Compared with the previous request for local commercial commissions to submit to the Ministry of Commerce, the "Notice" clearly states that the amount of RMB invested by foreign-invested enterprises will reach 300 million yuan or more, and it needs to be reported to the Ministry of Commerce for review. Two-way flow speed-up Once the RMB FDI pilot management measures are officially introduced and implemented, it will mean that the non-investment shareholder loans and the three types of institutions enter the inter-bank bond market, and the offshore RMB funds will increase by one. Ma Jun, chief economist of Deutsche Bank Greater China, also said that the transparency of the RMB FDI pilot scheme will promote the RMB loan business, RMB bond issuance and RMB stock issuance in Hong Kong, which will help alleviate Hong Kong's RMB deposits and assets (products). ) Lack of bottlenecks. Ma Jun estimates that if 20% of China's annual FDI (about 100 billion US dollars) is carried out by the renminbi in Hong Kong, the assets created by renminbi bonds or loans in the offshore market in Hong Kong will reach 130 billion yuan, close to The current balance of RMB bonds in Hong Kong (140 billion yuan). “From the previous situation in which RMB FDI was submitted for approval, the central bank is cautious about the sources of RMB funds from overseas companies, such as RMB income from cross-border RMB settlement with domestic companies, or overseas parent companies issuing RMB bonds and stocks abroad. The above-mentioned bankers revealed to the reporter that “the foreign parent company is not encouraged to exchange foreign currency directly into RMB for investment abroad without any RMB income, because it seems more like avoiding foreign currency investment. The SAFE review requirements.†Ma Jun also pointed out that as long as RMB FDI replaces foreign currency FDI, the impact on domestic currency is neutral. “This is because in the case of foreign companies using foreign currency for FDI, they will increase domestic liquidity by forcing the central bank to purchase foreign exchange. Compared with foreign currency FDI, RMB FDI will not increase domestic liquidity.†He said so. Li Keqiang, Vice Premier of the State Council, announced in Hong Kong on August 17 that the six major policies support the further development of Hong Kong. Among them, the financial sector launched 20 billion yuan "RQFII" (RMB overseas qualified institutional investors), the mainland pushes Hong Kong stock portfolio ETF and steadily promotes RMB FDI. Wait.