Basic Info.
Model NO.
SERIES DRAIN VALVE
Temperature
High Temperature
Structure
Through Way 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 Control
Continuous Flow Control Conditions
Flow Control Way
Continuous Flow Control Conditions
Leakage Class
0 Leakage (API598)
Materials
Carbon Steel/Alloy Steel/Stainless Steel
Forging Mode
Standard Connection: Sw/Optional Connection: Bw or
Casting Mode 1
ANSI900 and Below Use Flange Connections
Casting Mode 2
ANSI1500 and Above Are Butt Welded Connections
Casting Mode 3
Cap of Angle and Straight Through Body: Bolted
Product Description
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 |
About SNT Blow-down Valves
SNT Machinery (Qingdao) Co., Ltd., affectionately known as SNT, stands at the forefront of innovation as a valve manufacturing powerhouse. Mastering the art of fluid dynamics, SNT specializes in the meticulous development, avant-garde design, and precision production of cutting-edge fluid flow and valve technology.
SNT The SNT drain valve is expertly engineered to thrive in diverse high-demand scenarios such as continuous throttling control. It excels in applications like boiler continuous drain, high-pressure vessel sampling, reactor sampling, high-pressure discharge, boiler feed pump bypass system release, and more. When faced with high-pressure differentials or corrosive conditions like heater drains to condensers at high flow rates, SNT's design outshines traditional valves in durability and reliability. Unlike fragile traditional cutoff and even venturi valves, the SNT valve endures the challenges of high flow rates and erosion. Its robust construction is perfectly suited for continuous drain environments, preventing damage and ensuring longevity.
The SNT The SNT drain valve redefines conventional internal design concepts with its innovative approach. It features a streamlined flow channel between the valve core and cylindrical valve seat, accelerating fluid flow effortlessly. As fluid reaches the downstream valve seat, the chamber dramatically enlarges, causing a pressure drop that propels rapid fluid expansion towards the flow center. This leads to swift energy dissipation and evaporation, inducing a turbulent condition. This process guarantees efficient discharge, allowing fluid to vaporize when supersaturated and simultaneously cool any remaining liquid, exemplifying the sophisticated use of flash evaporation in liquid flow.
To cater to diverse device requirements, we offer valves across a pressure spectrum from ANSI 150 to ANSI 2500. The standard stop valve sizes range from 3/4"(DN20), 1"(DN25), 1-1/2"(DN40), 2"(DN50), 2-1/2"(DN65), to 3"(DN80). SNT valves are generally crafted with an angular connection to ensure a seamless fluid flow. Our through way type stop valves are also at your disposal. Depending on the desired control, options span manual, pneumatic, and electric configurations. For precise throttling control, SNT employs computational Fluid Dynamics using the Fluent-Code to meticulously simulate and analyze flow channels and pressure drops within its unique internal design. Every internal component of SNT valves is typically fortified with high-grade Co-Ni based alloys or treated with Cr-N ceramic coatings, safeguarding against abrasion and corrosion from high-pressure scenarios and rapid flow rates. Product Description
SNT - SERIES DRAIN VALVE 3/4"(DN20)~3"(DN80) ANSI Class 150~1500 | Applications | -Steam boiler, evaporator and other boiler water continuous drain control
-Flow and pressure regulation and flash application
-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 | 3/4 "(DN20), 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 | |
| Casting mode | -ANSI 900 and below with flange connections
-ANSI1500 and above are butt welded
- Cap of Angle body: bolted connection | Metal self-sealing structure form for option |
Design calculation
| -Angular connection
- Under the condition of high pressure difference,
two or more Angle valves are used for fluid pressure precise control
-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
- Suitable for forging, casting, bar stock
- Heat treatment of valve internals
Valve core: surface hardening or nit riding treatment
Seat: Nit riding or surfacing with STL alloy | Other hole types: Conical hole/labyrinth runner
Surface hardening: surfacing STELLITE Gr.6
Surface hardening of seat: Other options |
| Material | -Carbon steel
- Alloy steel
- Stainless steel
High quality Alloy steel | A105N, A182-F22
A182-F304(L),A182-F316(L)
As required by customer | |
Notes:
1. S101 Hard Surface Technical Description: With a robust hardness of HRC≥55, this metallurgical combination is designed to be resilient, ensuring it remains intact and reliable.
2. S503 Hard Surface Technical Description: Featuring a substantial thickness of 1.5mm, this surface boasts a hardness of HRC≥55 and a binding force of 400MPa, engineered to maintain durability.
3. S505 Hard Surface Technical Description: This refined surface offers a slim thickness of 0.3mm and an impressive hardness of HRC≥65, with a binding force of ≥250MPa for superior performance.Rated Flow Coefficient Comparison TableApplication of Typical Working Conditions As shown in the figure on the left, in accordance with ASME B31.1 Power Boilers and Piping guidelines, these intermittent drain valves are predominantly employed in Zone 2, where they are seamlessly integrated directly into the boiler or pipingsystems. Additionally, there are continuous drain valves, traps, safety valves, and more, enhancing the system's functionality.
In line with §122.1.4 of ASME B31.1 Power Boilers and Piping, the piping architecture typically incorporates two valves in series: a Y-type intermittent drain valve coupled with an emergency stop valve, ensuring optimal control.
The intermittent drain valve is adeptly designed with a lever-type rapid discharge mechanism, facilitating swift opening and closure. When activated, the valve expedites the expulsion of sediment, dirt, and other particles from the boiler's base efficiently-completed within 3 seconds. Prolonged discharge could lead to excessive boiler water loss, causing resource wastage. The flow path resembles a straight pipeline.
The emergency stop valve ensures a stringent pipeline cut-off, preventing resource wastage in the event of an intermittent drain valve malfunction.
Conditions&Solutions
Pressure and Temperature Parameters: The Through Way Type High Pressure Boiler Blow-down Valves - DN65 Specs are crafted to withstand rigorous pressure and temperature demands. Our product excels under high-stress environments, maintaining peak performance, and offering unparalleled reliability and safety in challenging scenarios.
SNT Valve Advantages
1. SNT Machinery (Qingdao) Co., Ltd. stands as a premier entity that seamlessly integrates design, development, production, sales, and service in industry and trade, marking its place as a business powerhouse with a comprehensive approach.2. Experience unparalleled quality, competitive pricing, and exceptional service delivered by our professional team, equipped with innovative solutions to tackle any challenge with creativity and precision.
3. We are accredited with Manufacture for Special Equipment Type Test Certificates, ensuring compliance and excellence in all our products.
4. Adhering to the stringent standards of ISO9001 and API SPECQ, our company meticulously prepares and implements essential control methods, processes, and equipment (including inspection and testing apparatus). This ensures that our design, manufacturing, inspection, testing, installation, and service processes are not only compatible but also comprehensive and seamless within the entire system.
5. Our stellar research and development team is a beacon of innovation, boasting nearly 100 patents that elevate our product offerings to new heights.
6. SNT Machinery excels as an enterprise dedicated to providing integrated solutions for control valves and associated actuators, serving a diverse range of industries including Petroleum, Chemical, Power, Storage Tank, Air Separation, Coal Chemical, and Liquefied Natural Gas, ensuring exceptional performance and reliability across all sectors.
Production application
Company Profile
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.
