Basic Info.
Model NO.
Y-Type Boiler-down valve
Structure
Y-Global Globe Valve
Sealing Form
Gland Packings Globe Valve
Stem Thread Position
Outside Screw Stem Globe Valve
Standard
DIN, GB, ANSI, JIS
Type
Through Way Type/Angle Type/Series Type and Y Type
Specifications
DN20/DN25/DN40/DN50/DN65/DN80
Nominal Pressure
ANSI150-ANSI2500
Fluid Temperature
-20ºC~566ºC
Connection Type
Sw, Bw, Flanged
Flow Characteristics
Linear, on-off
Actuators
Manual Operation, Pneumatic Operation, Electric Op
Leakage Class
0 Leakage (API598)
Materials
Carbon Steel/Alloy Steel/High Quality Alloy Steel/
Flow Control
Continuous Flow Control Conditions/Intermittent FL
Pressure Clas
ANSI1500 for Rt Test
Valve Body Material
A105n
Product Description
Product Specifications
| Applications | Steam boiler, evaporator and other boiler water intermittent drain control | Manual operation control | |
| Nominal pressure | ANSI 150, 300, 600, 900, 1500 | Pressure class >=ANSI1500 for RT test | |
Nominal diameter
| Forging mode | 1"(DN25) and 1.1/2"(DN40), 2"(DN50) | ANSI 150, 300, 600, 900, 1500 |
| Casting mode | 2.1/2"(DN65), 3"(DN80) | ANSI 150, 300, 600, 900, 1500 |
Connection mode |
Forging mode | Standard connection: SW;
Optional connection: BW or flanged |
Pair flanges for option: flat welded flange
Butt welded flange |
Casting mode | -ANSI900 and below are connected with flanges
-ANSI1500 and above are butt welded
- Cap of Angle body: bolted connection |
Design calculation | type stop valve - The size of the seat hole is calculated by strict design
Verified by CFD analysis and testing
Compound hole plate can be configured for actual high pressure difference conditions | Replace seat and core quickly STELLITE Gr.6
Surface hardening: surfacing STELLITE Gr.6
Surface hardening of the seat; Other options | -Suitable for forging and casting
- Heat treatment of valve internals
Valve core: surface hardening or nitriding treatment
Seat: nitriding or surfacing with STL alloy |
Materials | - Carbon steel
- Alloy steel
- Stainless steel
- High quality Alloy steel | A105N
A182-F22
A182-F304(L
A182-F316(L)
As required by customer | |
Flow control | Intermittent flow control condition | Manual control | |
About SNT Blow-down Valves
SNT Machinery(Qingdao) Co., Ltd. (referred to as SNT) is a valve manufacturing company that specialized in the development, design and production of fluid flow and valve technology.SNT drain valve can be widely used in continuous throttling control, such as: boiler continuous drain, high pressure vessel and reactor sampling, high pressure discharge, boiler feed pump bypass system release device, high pressure difference (pressure release) conditions, heater drain to the condenser process due to corrosion and high flow rate flash conditions. Compared with the traditional valve, the SNT valve is more robust and durable, which is suitable for continuous drain conditions that can cause serious damage to the valve. Because in the continuous drain working condition, the flow rate is high, the erosion is more serious, the traditional cutoff drain valve is fragile, even the venturi valve is also fragile.The SNT drain valve breaks the traditional internal structure design concept. The flow channel between the valve core and the cylindrical valve seat adopts smooth design, which can accelerate the fluid flow until the fluid reaches the downstream of the valve seat, and the chamber suddenly becomes larger. At this time, the pressure drop caused by the center part of the flow channel leads to the rapid expansion of the fluid toward the flow center part. While the energy of the fluid flow also quickly disperses and evaporates, and the fluid enters turbulent condition. The efficient discharge process ensures that the fluid can form steam when supersaturated, while cooling the remaining liquid, which is a typical way to use flash evaporation in liquid flow.In order to meet the various needs of the device, we can produce valves in the pressure range of ANSI 150 to ANSI 2500. Standard stop valve size is 3/4"(DN20), 1"(DN25), 1.1/2"(DN40), 2"(DN50), 2-1/2"(DN65) and 3"(DN80). The standard form of SNT valve is angular connection, to allow a uniform flow of fluid.The through way type stop valves are also available. According to the control, it can be divided into manual, pneumatic and electric control. For accurate throttling control, based on the flow evaluation in the SNT internal-design structure, the Fluent-Code of a computational Fluid Dynamics is used to simulate and analyze the flow channel and its pressure drop. All SNT internals are usually surface-hardened with high-quality Co-Ni based alloys or surface-treated with Cr-N ceramic coatings to prevent abrasion and corrosion due to high pressure drops and flow rates.SNT drain valves are the product of our extensive experience and fluid flow knowledge combined with valve expertise. Structural Features
| No. | Part name | Standard materials | No. | Part name | Standard materials |
| <ANSI 900 | >=ANSI1500 | <ANSI900 | >=ANSI 1500 |
| 1 | Valve body | A105N | A105N | 15 | Screw holder | HBsc2 | HBsc2 |
| 2 | Top cover | A105N | A105N | 16 | Flat head round key | Carbon steel | Carbon steel |
| 3 | Body screw | A193-B7 Colored zinc plating | A193-B7 Colored zinc plating | 17 | Lock nut | Carbon steel + galvanized | Carbon steel + galvanized |
| 4 | Body nut | A194-2H Colored zinc plating | A194-2H Color zinc plating | 18 | Hex socket screws | 304SS | 304SS |
| 5 | Valve core | A276410+HF | 316+S503+S505 | 19 | Nameplate | 304SS | 304SS |
| 6 | 304SS | A276410+HF | 316+ZY08 | 20 | connecting flange | Carbon steel | Carbon steel |
| 7 | Wrap shims | 304+GRAPHITE | 304+GRAPHITE | 21 | Limit anti-turn block | Carbon steel + galvanized | Carbon steel + galvanized |
| 8 | Sleeve | 440C+HF | 316+S101 | 22 | Nuts | Carbon steel + galvanized | Carbon steel + galvanized |
| 9 | Wrap shims | 304+GRAPHITE | 304+GRAPHITE | 23 | Thrust needle roller bearings | Bearing steel (standard material | Bearing steel (standard material |
| 10 | Packing plate | A351 CF8 | A351 CF8 | 24 | Hex set screws | 304SS | 304SS |
| 11 | Nuts | A194-2H | A194-2H | 25 | Packing gland | A276410 | A276410 |
| 12 | Screw | A193-B7 | A193-B7 | 26 | Packing assembly | Flexible graphite | Flexible graphite |
| 13 | Support stand pole | Carbon steel + galvanized | Carbon steel + galvanized | 27 | Packing pad | A276410 | A276410 |
| 14 | Hex head bolts | Hex head bolts | Hex head bolts | 28 | Hand wheel | Carbon steel | Carbon steel |
Notes:
1.S101 hard surface technical description: HRC≥55, metallurgical combination, not easy to fall out;
2.S503 hard surface technical description: thickness 1.5mm, hardness HRC≥55, binding force 400MPa, not easy to fall out;
3.S505 hard surface technical description: thickness 0.3mm, hardness HRC≥65, binding force ≥250MPa
Application of Typical Working ConditionsAs shown in the figure on the left, according to ASME B31.1 Power Boilers and Piping, intermittent drain valves are usually used in Zone 2 and are installed directly in boiler or boiler piping. There are also continuous drain valves, traps, and safety valves, etc.
According to §122.1.4 of ASME B31.1 Power Boilers and Piping, the piping is usually fitted with 2 valves in series, a Y-type intermittent drain valve and an emergency stop valve.
The intermittent drain valve usually adopts the lever type rapid discharge mechanism, which can realize the rapid opening and closing. When the valve is opened, the sediment, dirt and other particles at the bottom of the boiler can be discharged quickly, no more than 3S. If the time is too long, a large amount of boiler water will be discharged, resulting in a great waste of resources. The flow channel is close to the straight pipeline.
The emergency stop valve is used to realize the strict cut-off of the pipeline and prevent the waste of resources when the previous intermittent drain valve fails.
Conditions&Solutions
Standard Mat.Comparison
| No. | Part name | Standard material | No. | Part name | Standard material |
| <ANSI 900 | >=ANS|1500 | <ANSI900 | >=ANSI 1500 |
| 1 | Valve body | A105N | A105N | 83 | Screw holder | HBsc2 | HBsc2 |
| 2 | Top cover | A105N | A105N | 85 | Flat head round key | Carbon steel | Carbon steel |
| 3 | Body screw | A193-B7 Colored zinc plating | A193-B7 Colored zinc plating | 86 | Lock nut | Carbon steel + galvanized | Carbon steel + galvanized |
| 4 | Body nut | A194-2H Colored zinc plating | A194-2H Color zinc plating | 87 | Hex socket screws | 304SS | 304SS |
| 5 | Valve core | A276410+HF | 316+S503+S505 | 88 | Nameplate | 304SS | 304SS |
| 6 | Valve seat | A276410+HF | 316+ZY08 | 89 | Connecting flange | Carbon steel | Carbon steel |
| 8 | Wrap shims | 304+GRAPHITE | 304+GRAPHITE | 90 | Limit anti-turn block | Carbon steel + galvanized | Carbon steel + galvanized |
| 9 | Sleeve | 440C+HF | 316+S101 | 91 | Nuts | Carbon steel + galvanized | Carbon steel + galvanized |
| 14 | Wrap shims | 304+GRAPHITE | 304+GRAPHITE | 92 | Thrust needle roller bearings | Bearing steel (standard material | Bearing steel (standard material |
| 17 | Packing plate | A351 CF8 | A351 CF8 | 93 | Hex set screws | 304SS | 304SS |
| 23 | Nuts | A194-2H | A194-2H | 252 | Packing gland | A276410 | A276410 |
| 24 | Screw | A193-B7 | A193-B7 | 255 | Packing assembly | Flexible graphite | Flexible graphite |
| 80 | Support stand pole | Carbon steel + galvanized | Carbon steel + galvanized | 257 | Packing pad | A276410 | A276410 |
| 81 | Hex head bolts | 304SS | 304SS | 572 | Handwheel | Carbon steel | Carbon steel |
SNT Valve Advantages
1. SNT is the set design, development, production, sale and service of industry and trade-oriented enterprises.2. Good quality, price and service by professional workers with creative solutions to problems.
3. Manufacture for Special Equipment Type Test Certificates.
4. According to the requirements in ISO9001 and API SPECQ, our company determines and preparencessary control methods, processes and equipment(including inspection and testing equipment), as well as process equipment, so as the ensure the compatibility of design, manufacturing, inspection, test, installation and service with the whole system and their completeness.
5. Excellent research and development team. Nearly 100 patents for products.
6. SNT is one enterprise specializing in integrated solutions for Control valves and associated actuators in Petroleum, chemical, Power, Storage Tank, Air Separation, Coal Chemical, Liquefied Natural Gas Industry etc.
Production application
Company Profile
SNT Machinery(Qingdao) Co. , Ltd is a producer of control valves, combines manufacturing, designing, sales and services in one. It has high starting point quick development SNT is located in Qingdao, Shandong province with an area for 42000m2, equipped with modern workshop and production equipment. It is a high-tech enterprise with independent intellectual property rights and imported advanced management and production experience. Now it has more than 150 workers, and R&D specialist accounts for 15%, graduates or with higher degrees account for 30%. Depending on high quality production management team and innovative technology research and development, now we produce large quantities of high quality vales used in petrochemical, oil and coal chemical industries. We have a sales value to nearly 100billion in the year 2017.
Now SNT has got the TS special equipment manufactuuring certificate and ISO 9001, and has acquired the net qualification certificate of SINOPEC,CNOOC, PETROCHINA and SINOCHEM. And we have got the National Patent in many technologies. We can design and manufacture all series of valves according to ANSI, API, DIN, BS, JIS standards. Combining the advantages of famous valves all cross the world and with independent research and development, until now we can manufacture all kinds of valves, including GLOBE, High Pressure Boiler Blow-down Valves, High-performance Butterfly Valves, Angle-regulating Valves, Eccentric Rotary Valves, T Three-eccentric Center Butterfly
Valves, V Ball Valves, High Wear-resistant Ball Valves, High Pressure Steam Valves, Micro-flow Control Valves, Self-operated Control Valves, Cryogennic Valves tc, Driving form includes manual operation, power-drinven, pneumantic and hydraulic drive. Materials for main parts are A216WCB, A217 WC6/WC9, A351 CF8/CF8M/CF3/CF3M etc. Specification 1/2"~120", working pressure ANSI 150#~2500#, working temperature -196ºC~1100ºC.
Relying on advanced production technology management and qulity assurance system, SNT Valves have been widely used in petrochemical, oil, steel&iron, paper manufacturing and power station industries. Our customers include SINOPEC QILU branch, SINOPEC Qingdao branch, CNOOC Huizhou Refinery, PETROCHINA Guangxi branch, PETROCHINA Ningxia branch, SINOPEC Qingdao Refinery, SINOPEC Qingdao branch, CNOOC Huizhou Refinery, PETROCHINC Guangxi branch, PETROCHINA Ningxia branch, SINOPEC Changling branch, Jinan branch etc.
We make user's profits as our priority, devoting ourselves to the establishment of excellent quality and good brand, Our perfect quality assurance and after-sales systems guarantee that SNT valves join hands with all our customers and creat prosperity.
Address:
Shiao International 1602, Shinan District, Qingdao, Shandong, China
Business Type:
Manufacturer/Factory
Business Range:
Industrial Equipment & Components
Management System Certification:
ISO 9001, ISO 20000, IATF16949, HSE
Company Introduction:
SNT Machinery(Qingdao)Co., Ltd. Stands as a leading authority in control valve manufacturing. Based in the strategic hub of Qingdao, Shandong province, our sprawling 42, 000m² Facility is outfitted with cutting-edge workshops and advanced production equipment. As a high-tech enterprise, we take pride in owning independent intellectual property rights and implementing cutting-edge international management and production techniques. Our team of over 150 dedicated professionals includes 15% R&D specialists and 30% with graduate degrees or higher. This commitment to excellence and innovation enables us to produce a diverse array of top-tier valves, widely utilized across the petrochemical, oil, and coal chemical industries. In an impressive milestone, our sales neared 100 billion in 2017. SNT proudly holds the prestigious TS special equipment manufacturing certificate and ISO 9001 certification. We are honored to possess net qualification certificates from industry titans including SINOPEC, CNOOC, PETROCHINA, and SINOCHEM. Our technological prowess has garnered us multiple national patents. We design and manufacture an extensive range of valves adhering to stringent ANSI, API, DIN, BS, and JIS standards. By merging the finest attributes of world-renowned valves with our innovative R&D, we offer a comprehensive portfolio featuring GLOBE Valves, High-Pressure Boiler Blow-down Valves, High-performance Butterfly Valves, Angle-regulating Valves, Eccentric Rotary Valves, and beyond.
Our product lineup showcases V Ball Valves, High Wear-resistant Ball Valves, High-Pressure Steam Valves, Micro-flow Control Valves, Self-operated Control Valves, and Cryogenic Valves, available in manual, electric, pneumatic, and hydraulic driving forms. We use premium materials such as A216WCB, A217 WC6/WC9, and A351 CF8/CF8M/CF3/CF3M. Our specifications range from 1/2" to 120" in size, accommodating working pressures from ANSI 150# to 2500# and operating temperatures from -196º C to 1100º C. Utilizing our advanced production technology, precise management, and robust quality assurance systems, SNT valves earn trust across diverse industries including petrochemical, oil, steel, iron, paper manufacturing, and power stations. Our esteemed clientele features SINOPEC QILU branch, SINOPEC Qingdao branch, CNOOC Huizhou Refinery, PETROCHINA Guangxi branch, PETROCHINA Ningxia branch, among others. At SNT, we are devoted to maximizing customer profitability by consistently delivering superior quality and establishing a reputable brand. Our unwavering commitment to comprehensive quality assurance and exemplary after-sales services ensures that SNT valves cultivate enduring partnerships with our clients, driving mutual success and long-term prosperity.
