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., fondly known as SNT, stands as a pioneering force in the realm of valve manufacturing. With expertise rooted in the development, design, and production of advanced fluid flow and valve technology, SNT is dedicated to delivering unparalleled solutions that drive the industry forward.
SNT Introducing the SNT drain valve: a versatile marvel crafted for excellence in continuous throttling control. Ideal for applications such as boiler continuous drainage, high-pressure vessel sampling, reactor discharge, boiler feed pump bypass systems, and high-pressure differential environments, its robust design outshines traditional valves. Designed to withstand the intense conditions of continuous drain operations, the SNT drain valve excels where traditional cutoff valves, even venturi types, fall short against high flow rates and severe erosion.
The SNT drain valve represents a breakthrough in valve technology with its innovative internal structure design. Featuring a smooth flow channel between the valve core and cylindrical seat, it accelerates fluid movement to the valve seat's downstream. Here, a pressure drop triggers the fluid's rapid expansion towards the flow center, dispersing energy swiftly to create a turbulent state. This effective discharge process ensures steam formation when fluid becomes supersaturated, simultaneously cooling the residual liquid-a hallmark method of employing flash evaporation in liquid flow.
To cater to the diverse demands of varying systems, our production range includes valves capable of withstanding pressures from ANSI 150 to ANSI 2500. The standard stop valve dimensions begin at 3/4"(DN20), 1"(DN25), 1.1/2"(DN40), 2"(DN50), 2-1/2"(DN65), and extend to 3"(DN80). SNT valves come in a standard angular connection design, allowing for seamless fluid flow. Additionally, through-way type stop valves are available. Depending on control requirements, they are offered in manual, pneumatic, and electric versions. For precise throttling control, SNT employs advanced Computational Fluid Dynamics (CFD) analysis using Fluent-Code to evaluate flow channels and pressure drops. The internal components of SNT valves are surface-hardened with high-quality Co-Ni alloys or treated with Cr-N ceramic coatings to withstand abrasion and corrosion due to significant pressure drops and velocities. Product Description
SNT - A Name Synonymous with Excellence - 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 | |
Important Technical Notes:
1. S101 Hard Surface Technical Insights: Offering a formidable hardness of HRC≥55, with a metallurgical bond that ensures exceptional durability and resistance to wear.
2. S503 Hard Surface Technical Insights: Boasting a thickness of 1.5mm and a hardness of HRC≥55, combined with a binding force of 400MPa to ensure it stays intact.
3. S505 Hard Surface Technical Insights: With a fine thickness of 0.3mm, a heightened hardness of HRC≥65, and a binding force of ≥250MPa, it provides unrivaled robustness.Comprehensive Rated Flow Coefficient Comparison TableApplications in Typical Industrial Environments Highlighted in the illustration on the left, compliant with ASME B31.1 Power Boilers and Piping standards, these intermittent drain valves find their primary use in Zone 2, expertly installed directly in boilers or associated piping. Additionally, continuous drain valves, traps, and safety valves play pivotal roles in the system.
Per §122.1.4 of ASME B31.1 Power Boilers and Piping guidelines, the piping is typically equipped with a dual valve setup, including a Y-type intermittent drain valve paired with an emergency stop valve for enhanced safety.
The innovative intermittent drain valve features a lever-operated rapid discharge mechanism, enabling swift and efficient valve operations. When activated, this valve expeditiously expels sediment, dirt, and other debris from the boiler bottom within a swift 3-second window, preventing unnecessary water loss and resource wastage. The flow pathway is virtually linear, ensuring efficiency.
The dependable emergency stop valve serves as a crucial safeguard, ensuring complete shut-off and preventing resource wastage in the event of an intermittent drain valve malfunction.
Conditions&Solutions
Pressure and Temperature Parameters
SNT Valve Advantages
1. SNT Machinery (Qingdao) Co., Ltd. stands at the forefront of industrial innovation as a versatile enterprise committed to excellence across design, development, production, sales, and customer service.2. Experience unparalleled quality, competitive pricing, and exceptional service delivered by our expert professionals equipped with innovative solutions to tackle any challenge.
3. Our commitment to superior manufacturing is evident through our Special Equipment Type Test Certificates, reflecting our dedication to safety and performance. Manufacture for Special Equipment Type Test Certificates.
4. Adhering to the stringent standards of ISO9001 and API SPECQ, we meticulously establish essential control methods, processes, and equipment (including inspection and testing apparatus), ensuring our design, manufacturing, inspection, testing, installation, and service processes seamlessly integrate with and complete the entire system.
5. Our outstanding research and development team proudly boasts nearly 100 patents, showcasing our commitment to innovation and technological advancement.
6. SNTNT is a leader in providing comprehensive and integrated solutions for control valves and their associated actuators, serving a diverse array of industries including petroleum, chemical, power, storage tank, air separation, coal chemical, and liquefied natural gas 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.