High Pressure & Temperature Boiler Blow-Down Valves - Through Way Type DN20

• Customization: Available
• Media: Gas
• Temperature: High Temperature
• Model NO.: SERIES DRAIN VALVE
• Actuator: Manual
• Material: Carbon Steel
• 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
• Rated Stroke: 25405060 mm
• 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
• Transport Package: Wooden
• Trademark: SNT
• Origin: China
• HS Code: 8481804090
• Production Capacity: 500000PCS/Year

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

Introducing SNT Machinery (Qingdao) Co., Ltd., affectionately known as SNT, a distinguished valve manufacturing powerhouse. We specialize in the meticulous development, innovative design, and proficient production of advanced fluid flow and cutting-edge valve technology.

SNT Our revolutionary drain valves by SNT are engineered for superior performance in continuous throttling control applications. They are versatile enough for use in critical functions such as boiler continuous drain, high-pressure vessel and reactor sampling, high-pressure discharge, boiler feed pump bypass system release, and heater drain to condenser processes. Designed to withstand the challenges posed by high flow rates and severe corrosion, these robust and durable valves outperform traditional counterparts, including the fragile cutoff and venturi valves.

The pioneering SNT drain valve redefines the conventional internal structure design. It features a streamlined flow channel between the valve core and cylindrical seat, accelerating fluid dynamics until it reaches downstream, where the chamber enlarges. This design induces a significant pressure drop that facilitates rapid fluid expansion, leading to energy dispersion and evaporation, creating turbulence. The efficient flow discharge ensures steam formation in supersaturated conditions while thermally managing residual liquids through flash evaporation.

To cater to diverse operational requirements, SNT offers an impressive range of valves in the ANSI pressure spectrum from 150 to ANSI 2500. The standard stop valve sizes available are 3/4" (DN20), 1" (DN25), 1.1/2" (DN40), 2" (DN50), 2-1/2" (DN65), and 3" (DN80). SNT valves predominantly feature an angular connection to facilitate seamless fluid dynamics. The through way type stop valves are versatile in control options, including manual, pneumatic, and electric modes. For precision throttling, we utilize computational Fluid Dynamics with Fluent-Code to simulate and analyze flow channels and pressure differentials. Our internals are fortified with high-quality Co-Ni alloy surface treatments or Cr-N ceramic coatings to resist abrasion and corrosion under extreme pressure and flow conditions.



 

Product Description

SNT: A legacy of excellence and innovation in precision engineering. - SERIES DRAIN VALVE: Elevate your expectations with our drain valves, characterized by superior durability and reliability.
3/4"(DN20)~3"(DN80) ANSI Class 150~1500: Spanning a versatile range, our valves are meticulously engineered to meet diverse industry standards, ensuring exceptional performance across applications.
 

^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 internalsValve core: surface hardening or nit riding treatmentSeat: Nit riding or surfacing with STL alloy		^Other hole types: Conical hole/labyrinth runnerSurface hardening: surfacing STELLITE Gr.6Surface hardening of seat: Other options
^Material		^-Carbon steel- Alloy steel- Stainless steel High quality Alloy steel	^A105N, A182-F22A182-F304(L),A182-F316(L)As required by customer

 

<sup>Notes: Critical insights into our advanced surface technology and valve design.
1. S101 hard surface technical description: Experience durability with HRC≥55 hardness, metallurgical bonding guarantees longevity and resistance to peeling.
2. S503 hard surface technical description: Precision crafted with a thickness of 1.5mm, a robust hardness of HRC≥55, and a binding force of 400MPa, ensuring steadfast performance.
3. S505 hard surface technical description: Ultra-thin design with 0.3mm thickness, remarkable hardness of HRC≥65, and a binding force of ≥250MPa, engineered for superior resilience.</sup>



Rated flow coefficient comparison table: Comprehensive data at your fingertips for informed decision-making.



Application of Typical Working Conditions: Adaptability redefined for a wide spectrum of operational scenarios.
 

^{As 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. Elegantly engineered for precision and safety in demanding environments.}

<sup>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. A dual-valve system ensures enhanced safety and operational efficiency.

The intermittent drain valve usually adopts the lever type rapid discharge mechanism, which can realize the rapid opening and closing. Designed for swift and efficient discharge of impurities. 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. Precision-engineered for optimal resource conservation and efficiency.

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. Ensuring absolute reliability and control within critical systems.</sup>

Conditions&Solutions

Pressure and Temperature Parameters: Unveiling Excellence in Precision and Performance

SNT Valve Advantages

 

^{1. SNT Machinery (Qingdao) Co., Ltd. is a dynamic enterprise that seamlessly integrates design, development, production, sales, and service, offering an industry-leading approach that is both commerce and trade-oriented.}

<sup>2. Experience superior quality, competitive pricing, and exceptional service provided by a team of professional workers dedicated to innovatively solving challenges.
3. Proudly producing equipment that earns Special Equipment Type Test Certificates, ensuring top-tier manufacturing standards.</sup>

^{4. In strict accordance with ISO9001 and API SPECQ standards, SNT meticulously determines and prepares essential control methods, processes, and equipment, including rigorous inspection and testing tools. We ensure that design, manufacturing, inspection, testing, installation, and service processes are fully compatible and complete throughout the system.}

<sup>5. Benefit from our exceptional research and development team, boasting nearly 100 patents, demonstrating our commitment to innovation and quality.
6. SNT is a premier enterprise specializing in providing comprehensive, integrated solutions for control valves and their associated actuators, serving diverse industries such as Petroleum, Chemical, Power, Storage Tank, Air Separation, Coal Chemical, and Liquefied Natural Gas.</sup>

 

Production application

 

 

Company Profile