Basic Info.
Model NO.
Q347F 150lb-600lb DN15-DN2000
Nominal Pressure
ANSI CLASS 150-900
Channel
Straight Through Type
Structure
Fixed Ball Valve
Temperature
Normal Temperature
Application
Industrial Usage
Transport Package
Container
Specification
0.5kg-2000kg
Product Description
Structure and characteristics of pneumatic ball valve
(1) Security
The ball valve specially designed for coal chemical industry and petrochemical industry is designed, selected and calculated in strict accordance with ISO 17292, API 608, API 6D, ASME B16.34, GB / T 12237 and GB / T 12224.
The shell of the valve shall be made of forged or cast high-quality materials, and the chemical composition and mechanical properties of the materials shall meet the requirements of ASTM / ASME; the corresponding non-destructive testing shall be conducted according to different specifications and the owner's requirements; ut non-destructive testing shall be in accordance with ASTM a388, and the surface Pt nondestructive testing shall be in accordance with ASTM e165; the casting materials shall also comply with the provisions of MSS SP-55.
The minimum wall thickness of the ball valve shell (valve body and end cover) shall not be less than the provisions of ASME B16.34 or GB / T 12224, and the corrosion allowance shall not be less than 3 ~ 5mm, so as to ensure the safety of the valve under the design and service pressure and the long service life of the valve under normal use and operation; meanwhile, the connecting fasteners for pressure bearing of the valve shall be in accordance with ASME B16.34 and GB / T 12224 and other standards are calculated and checked, and materials are selected in strict accordance with ISO 17292, API 608, API 6D, NACE mr0175, ASME / ASTM and other standards and specifications to ensure the safety of valves in long-term use.
After passing the design, calculation and check, the ball valve of Chevron company is also in accordance with ASME The calculation method of is calculated and checked again, and three-dimensional modeling is introduced. Advanced auxiliary tools such as SolidWorks and ANSYS are used to carry out stress and deformation finite element analysis on key parts such as valve body, end cover, ball, valve seat and valve stem. The tensile strength and bending resistance of the valve after assembly are simulated and analyzed. According to the analysis results, the secondary optimization design of the valve is carried out to ensure that the valve is in good condition Safety and high cost performance before manufacturing.
(2) Reliability
Material reliability
The valve body, end valve body, ball, valve stem, seat ring and other metal materials of Chevron pipeline ball valve are all in accordance with ASME / ASTM, ISO 17292, API 608 and API High quality castings and forgings specified in 6D standard and specification adopt the most advanced manufacturing process in China, select first-class professional manufacturers, and strictly follow the heat treatment specification and advanced heat treatment process of corresponding materials to ensure that the performance indexes of materials meet the relevant marks and specifications; at the same time, the non-metallic sealing materials of our company's petrochemical ball valves adopt domestic and international certification And strictly control its downstream suppliers to be internationally renowned raw material suppliers to ensure high reliability of valve body performance.
Reliable sealing design
a. Seat seal design:
The valve seat can be designed into "metal metal", "metal non metal" and "metal non metal + metal" according to the service conditions of ball valve and the owner's requirements.
(a) "Metal metal" hard seal seat
Specially designed hard seal seats:
The floating ball valve can adopt double valve seat, two-way or one-way sealing design. When one-way sealing, the inlet side pre tightens the valve seat, and the outlet end seals the valve seat.
All fixing balls are two-way sealing valve seat.
The elastic metal sealing valve seat is equipped with spring device to realize dynamic compensation and solve the problem of excessive friction torque caused by thermal expansion. (patent certificate No. ZL 2012 2 0586582.2)
The sealing surface of the valve seat is wide, so that the valve seat can bear enough sealing pressure. After the ball and the valve seat are grinded, the sealing pair has a high matching degree, which ensures the reliable sealing.
The scraper design: the scraper is designed at the contact parts with the ball and valve body, which can effectively scrape the media attached to the ball and valve body;
* dust proof design: scraper and dust-proof structure are designed at the head and tail of the valve seat, which can effectively prevent the medium from entering into the gap between the valve seat and the end valve body, and ensure the normal and reliable use of the valve seat.
Hardening technology of ball and seat sealing surface of metal hard sealing valve seat:
"Metal metal" valve seat seal adopts special hardening technology, such as hard alloy, nickel base alloy and other high hardness materials, such as tungsten carbide (TCC), stellite alloy (STL), nickel base alloy (Ni60), with hardness of hrc45 ~ 74; surfacing welding or spray welding tungsten carbide (TCC), stellite alloy (STL) and nickel base alloy on the sealing surface of valve seat with ball seal (ni55), hardness hrc42 ~ 74. The hardness difference between the sealing surface of the ball and the valve seat is about hrc5. After the surface hardening of the two surfaces, the surface of the ball and the valve seat can achieve the mirror effect and form a close fit. Under the force of spring and medium, the sealing effect of low leakage and zero leakage can be achieved.
The service temperature of "metal metal" valve seat seal can reach 980 ºC, which can be used in harsh service conditions such as high temperature medium, particle medium and severe erosion, and can provide safe and reliable seal continuously.
(b) "Metal non metal" soft seal seat:
The "metal nonmetal" soft sealing valve seat is inlaid with non-metallic sealing plug-in on the sealing surface of the valve seat and the ball. The special design is adopted between the plug-in and the ball sealing spherical surface, which can ensure that they are completely consistent and closely fit, and can form a reliable sealing effect under the force of spring and medium. The soft seal seat seal designed by Chevron is zero leakage, i.e. ISO 5208 a.
"Metal nonmetal" soft sealing seat materials can be made of high molecular plastic rptfe, nylon, Devlon, peek, ppl and anti explosion fluororubber (Viton AED) according to the service medium, working conditions and the requirements of the owner, so as to meet the requirements of different service conditions.
"Metal non metal" soft seal seat
(c) , metal nonmetal + metal "multiple seal seat:
"Metal - Nonmetal + metal" valve seat sealing structure is metal seal and non - goldMetal seal combination of a special valve seat, is also a multi-stage and multi-stage sealing seat structure, using a combination of metal and non-metal sealing design, soft seal using anti explosion fluororubber (Viton) Materials such as AED, rptfe, nylon, Devlon, peek, ppl, etc. "metal metal" can achieve reliable sealing performance of valve seat under different media pressure, just like the above-mentioned single metal sealing structure and function.
The valve seat is designed with spring loading, which can realize the initial sealing between the valve seat and the ball, and can also compensate for the wear of the valve seat plug-in after long-term use; for the "metal non-metal" and "metal non-metal + metal" valve seat design has fireproof structure, which can ensure the effective sealing of ball valve in case of fire and reduce or prevent fire.
B seat scraper and dust proof design
For ball valves used in coal chemical industry, petrochemical industry and other working conditions, due to the complexity of the medium, particles or other impurities may appear, or the medium is easy to crystallize. These impurities or crystals will deposit on the surface of the ball. If there is no special design and structure to eliminate the scaling problem, the scaling will cause serious damage and damage to the valve seat during the opening and closing process As a result, serious leakage accidents such as valve seat failure and valve sealing failure are caused.
Based on the above problems, when developing the ball valve specially used in coal chemical industry, petrochemical industry and other working conditions, the special scraper structure is designed at the contact part between the ball and the valve seat sealing surface (see the figure below). During the valve opening and closing process, it can effectively clean the scaling attachment on the surface of the ball, scrape off the attachment, and protect the sealing surface of the valve seat from being scratched and damaged by the attachment At the same time, the dust-proof structure can be designed on the valve seat to effectively prevent impurities in the medium from entering the sealing gap between the valve seat and the valve body, so as to improve the reliability and service life of the valve seat seal.
c. Sealing design of valve stem and stuffing box
According to the service conditions, the valve stem seal of xifulong coal chemical and petrochemical ball valves can adopt the multiple seal design of "flexible graphite packing" or "O-ring + flexible graphite packing". For forged Petrochemical ball valves, the packing box adopts the sealing design of "metal wound gasket" or "O-ring + metal spiral wound gasket" to ensure the valve stem and stuffing box Reliable sealing performance can be achieved under various conditions.
Forging ball valve stem and stuffing box sealing structure casting ball valve stem sealing structure
Special stem seal design:
For coal chemical industry and petrochemical industry with high temperature and high pressure or other special and harsh service conditions, Chevron adopts specially designed valve stem sealing technology, adopts special material and high performance high reliability sealing packing, and packing wear compensation structure design to ensure high reliability and long service life of valve stem seal
a. Sealing design of connection between valve body and middle part of end valve body
The valve body and the middle part of the end valve body are connected to each other. According to the service conditions, multiple sealing structures of "metal wound gasket + metal metal hard seal" or "metal wound gasket + O-ring + metal metal hard seal" are adopted to ensure the reliable sealing of the valve in any case. The use of metal wound gasket and metal metal seal of body cover can ensure that even in case of severe fire, there will be no leakage of medium.
Sealing design of special valve body and end cover, valve body and stuffing box:
For coal chemical industry and petrochemical industry with high temperature and high pressure or other special and harsh service conditions, Chevron adopts the sealing technology of specially designed valve body and end cover, valve body and stuffing box, adopts special material and high performance sealing ring with high reliability to ensure the high reliability of valve body, end cover and stuffing box.
High reliability of valve rod drive chain
The valve stem of the special ball valve for coal chemical and petrochemical industry of Chevron is strictly in accordance with ISO 19272, API 608, API 6D and NACE Mr0175, ASME / ASTM and other standards and specifications are designed, calculated, checked and selected to ensure that the torque value of the minimum diameter of the valve stem is not less than 2 times of the maximum operating torque value of the valve, and the weakest part of the valve stem is designed outside the valve body and connected with the actuator, so as to ensure that the weakest part of the valve stem can be screwed even if the weakest part of the valve stem is screwed in case of accident or internal parts stuck Breaking will not cause other parts of the valve stem to break and fly out of the valve, causing other greater casualties. The valve will not cause damage to other parts of the valve, so as to ensure that the medium will not leak out.
(3) Meet the functions and requirements of ISO 19272 and API 608
Valve rod anti fly out, anti-static function design
As shown in the figure below, the valve stem is designed as a big and small head. The boss of the big head is installed inside the valve, the lower part of the boss is installed with the ball, and the upper part of the boss is installed with the stuffing box or anti flying ring (cast ball valve), and is limited by the stuffing box or anti flying ring, so that it can not escape outside the valve under any circumstances, so as to prevent the valve stem from flying out. At the same time, the valve rod, ball and valve body are also installed In addition to the matching installation with the valve stem, a compression spring is also designed to effectively ensure that the valve rod, ball and valve body form a conductive channel, which can release the static electricity generated by the friction between the ball and the sealing ring of the soft seal valve seat during the opening and closing process of the ball valve, so as to prevent fire or explosion caused by electrostatic spark.
Fire protection design.
The coal chemical and petrochemical ball valves of Chevron company are all in strict accordance with the owner's technical requirements, operating conditions and the provisions of ISO 19272, API 608, API 6D and other standards and specifications,The fire-proof structure is designed at the valve seat sealing structure and the joints with external leakage points such as middle flange of valve body, valve stem seal and stuffing box, and corresponding fire-proof parts are installed to ensure that the fire-proof performance of ball valve meets API 607 and API At the same time, these fire protection designs have passed the fire test and test conducted by relevant authorities, which proves that the fire protection design and structure of the chevron ball valve meet the requirements of the corresponding standards and specifications.
a. Fire protection design of valve seat
As shown in the figure below, in case of fire in the pipeline system, the soft sealing plug-in and fluororubber O-ring of the valve seat are burned, but the valve seat is designed with a composite fire-proof sealing ring of "flexible graphite sandwiched with stainless steel wire". At the same time, the sealing surface of the valve seat and the ball are designed with a metal metal metal hard sealing structure. At this time, closing the ball valve can effectively ensure the reliable sealing of the ball valve in case of fire and realize resistance The function of stopping or reducing fire.
b. Fire protection design of flange in body cover:
The middle part of the ball valve body and the end cover is connected by bolts. The "flexible graphite + stainless steel wire" gasket is used between the valve body and the end cover to form the first sealing fire prevention, and the metal of the body cover collides with the metal to form the second sealing fire prevention. As shown in the figure on the right.
c. Fire protection design of valve stem and stuffing box.
The stuffing box and valve rod sealing parts must be designed with safe and reliable fireproof structure. The flexible graphite packing is used for the fire-proof packing of the valve rod, and the metal spiral wound gasket is used between the stuffing box and the valve body.
Fire proof structure of forged ball valve stem and stuffing box
Limit device
The valve rod limit mechanism is designed for the full open and full close positions of the ball valve, so as to limit the accuracy of the valve opening and closing position, and it is also an effective means to make the limit of the transmission mechanism strictly correspond to the position of the ball valve switch.
Chevron handle operated ball valve has mechanical limit mechanism, and the limit mechanism is not limited by packing compression bolt, but a special limit boss and limit block combination limit is designed on the packing gland. This limit structure and design is more safe and accurate, and there will be no inaccuracy or valve switch position deviation due to packing bolt.
For the ball valve equipped with actuator, the gearbox operation, electric actuator, pneumatic actuator or electro-hydraulic linkage actuator are equipped with digital / mechanical valve position display modes. For intelligent electric actuator and pneumatic actuator with limiter, remote position monitoring and data sharing with control center can be realized.
Address:
No. 888 Weiyangba Road, Gaoling District, Xi′an, Shaanxi, China
Business Type:
Manufacturer/Factory
Business Range:
Industrial Equipment & Components, Instruments & Meters, Manufacturing & Processing Machinery
Management System Certification:
ISO 9001, ISO 14001, OHSAS/ OHSMS 18001, ASME
Company Introduction:
Brief Introduction
Xifolong Valve Group Co., Ltd., formerly Xi′an Xifolong Valve Co., Ltd., was established in 2009. The company covers an area of 80 mu, with a construction area of 43000 m2 and a registered capital of 208.88 million yuan. The company is located in Xi′an, the ancient capital of the thirteen dynasties, the starting point of the Silk Road, a world famous historical and cultural city, and Jinghe Industrial Park in Gaoling district with convenient transportation. The company is now a member unit of China Valve Standard Committee and valve standard setting unit, member unit of China Valve Association, and high-tech enterprise in Shaanxi Province.
Xifolong is a manufacturing enterprise specializing in the design, research, development, production, sale and service of valves in the fields of petroleum and natural gas transmission engineering, coal chemical industry, electric power, urban pipeline network, petrochemical industry, offshore platform, PTA, LNG, metallurgy and so on. Its products are well sold at home and abroad.
Xifolong has established a research and Development Center for valve technology, with more than 20 technical engineers from various high schools. It introduces the most advanced engineering software such as Auto CAD, ANSYS and Solidworks, and uses its advanced finite element analysis function to simulate and verify the rationality, reliability and safety of its design before mass production of new products.
Xifolong leads the R & D, manufacturing and technical services of medium and high-end valve products, and has established an advanced modern valve testing and testing center, which can conduct simulated working condition tests on valves: - 196 º C ultra-low temperature test, maximum 120MPa (15000psi) high-pressure gas test, 800 º C high-temperature test, 150 º C thermal pipe network valve thermal performance test, 300000 N. M torque test, etc Mobile spectrum analyzer, three-dimensional detector, helium mass spectrometer and other precision detection instruments; At the same time, Tat test can be carried out according to shell MESC specification, providing users with safe, reliable and long-life high-quality products.
With advanced and mature design and development ability, scientific and perfect quality control system, strict internal control management, reliable production and inspection ability, national and international authoritative system certification and product certification, XFL valve has obtained ISO9001, ISO 14001, OHSAS 18001, TS (A1, A2, B. ), API 6D, PED / CE, API 607 / 6fa, SIL3, ISO 15848 and other certifications and certificates, creating for chevron High quality high-end valve products provide reliable guarantee.
Xifolong has established a production and manufacturing center, with various processing equipment, CNC machine tools and processing centers, 4-meter heavy-duty CNC vertical lathe bearing 40 tons, 100 tons of large-scale CNC floor boring machine, several full-automatic ball valve welding machines, 5000 tons of super large valve pressure testing machines, 200 tons of valve assembly machines, etc., to quickly provide users with high-quality valve products strong guarantee.
The main products are ball valve, control valve, wellhead valve, gate valve, stop valve, check valve, butterfly valve and other seven series of valves, focusing on oil and gas pipeline valves, coal chemical special hard seal ball valve, oxygen valve, slag lock valve; City pipe network all welded valve; Marine engineering special valve; Thermal power system control valve, drain valve; Oil and gas field special intelligent control system valve; Metallurgical resistant Grinding valve; Petrochemical and PTA special valve and other special valve design, manufacturing and maintenance.
Diameter range: DN15-DN3500 (NPS1/2-140);
Pressure range: PN6 ~ PN760 (Class150 ~ Class4500), 15000psi(PN1200);