The main body of the valve used in gas, crude oil and refined oil pipeline transportation should not be less than 30 years old and have double sealing, fireproof and antistatic functions. When the valve chamber is abnormally pressurized, it has the function of automatic pressure relief and auxiliary sealing Structure and double blocking sewage structure. Ball valves are used to transport natural gas in the pipeline, flat gate valve used to transport crude oil and refined oil pipeline. The design and manufacturing standards for ball valves for natural gas are API6D "Pipeline Valves", ANSI B3118 "Natural Gas Transmission and Distribution Piping Systems," ANSI B16134 "Flanges, Threaded and Welded Valves," ANSI B16110 "Valve Structure Lengths", GB2237 "Flanged and butt welded steel ball valve", JB / T 7745 "pipeline ball valve", GB 12224 "general requirements of steel valves" and GB 12221 "flanged metal valve structure length" and other standards. When the ball valve body is cast, the material is ASTM A216 WCB or WCC. Body forgings, the material is ASTM A105. Ball valve ball material 2Cr13 or ASTM A105, which ball ball ball pounds of nickel-plated, nickel coating thickness of 30 ~ 75μm, GB ball valve ball is hard chrome plated. Stem and shaft materials are preferentially supplied with 1040 medium carbon anti-friction bearing steel or ANSI 302 stainless steel in 2Cr13 (ASTM A276 420) or ASTM A866-1994. When the working pressure is greater than 1010MPa, the choice of forged steel ball valve, in which the body, ball, stem and the shaft are blank forgings. The main pipelines for conveying natural gas are all channels, so that they can be cleaned by the sweeper. When the valve is closed, the medium that stays in the valve cavity will compress the inlet valve seat and the valve seat when the cavity pressure is overpressurized because of the increase of the ambient temperature, etc. The valve seat will be compressed. The spring, so that its pressure relief. Seat sealing surface inlaid with metal seat 1 ~ 115 mm above the PTFE soft seal seat, the seat is tapered, with the ball to form a reliable line seal. When the fire PTFE burns, the molded metal seat is pushed by the strong spring and forms a "hard seal" with the ball to meet the fire prevention requirements.
PP Thermoforming Plastic Sheet with good toughness, non-toxic, high temperature resistant,which can be designed to conductive and antistatic.PP thermoforming plastic sheet is widely be used in Electrical,Automotive ,Hard Disk Drive,Food,Cosmetics,Medical Packaging Industries.
Description:
1. Width: 200mm~750mm (Tolerance: ± 1mm) ;
2. Thickness: 0.2mm~2.5mm (Tolerance: ± 0.02mm) ;
3. Length is customized. it can be roll or cut size packed.
4. Color: black,natural,white,colorable,
5. Surface resistivity:
Conductive:10e4~10e6
Antistatic:10e9~10e11
Semi conductive:10e6~10e8
6. Mono layer or 3 layers co-extrustion
7. One side is glossy another side is matte
8. Certificates: ISO9001,REACH,CTI RoHS.
Features
1.Stable surface resistance
2.Good thermoforming characteristic Rigid,
3.Stable performance, not influenced by humidity.
4.Excellent conduction properties,Superior processing property.
5.High impact resistance,Excellent light transmittance.
6.Eco-friendly: odorless, tasteless, nontoxic, non pollution, easy to be recycled.
7.No burrs, no powdering or particle shedding observed on the tray
PP Thermoforming Plastic Sheet , Polypropylene Plastic Sheet ,Polypropylene Plastic Film, PP Plastic Film ,Polypropylene Sheet
Pujiang Yitong Plastic Electronic Co., Ltd. , http://www.yitongplastic.com
