Angle Type High Pressure & Temperature Boiler Blow-Down Valves 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

SNT Machinery (Qingdao) Co., Ltd., affectionately known as SNT, stands at the forefront of innovation in the realm of valve manufacturing. With a profound specialization in pioneering fluid flow and valve technology, SNT excels in the art of development, design, and production.

SNT The exceptional SNT drain valve is engineered for broad applications in continuous throttling control scenarios. Whether it's managing boiler continuous drainage, sampling from high-pressure vessels and reactors, or handling high-pressure discharge, this valve proves indispensable. It plays a vital role in boiler feed pump bypass system release devices, works effectively under high-pressure differential conditions, and aids in heater drainage to condensers, especially under challenging corrosion and high flow rate flash conditions. Unlike traditional valves, the robust and durable SNT valve is meticulously crafted for continuous drain operations that otherwise wreak havoc on standard valves. In these demanding scenarios, where high flow rates and severe erosion are common, the SNT valve outshines conventional cutoff drain valves and even the traditionally fragile venturi valves.

The innovative SNT drain valve revolutionizes conventional internal structure design concepts. The seamless flow channel between the valve core and cylindrical valve seat ensures a fluid journey that accelerates until reaching the downstream side of the valve seat, where the chamber expands significantly. This design induces a pressure drop at the flow channel's center, causing the fluid to rapidly expand toward the center. During this process, the energy of the fluid swiftly disperses and evaporates, transitioning into a turbulent state. This efficient discharge process is critical for enabling the fluid to form steam upon supersaturation, simultaneously cooling the remaining liquid-an exemplary use of flash evaporation in liquid dynamics.

To cater to the diverse requirements of different devices, we offer valve production across a pressure range from ANSI 150 to ANSI 2500. Our standard stop valve sizes include 3/4" (DN20), 1" (DN25), 1.1/2" (DN40), 2" (DN50), 2-1/2" (DN65), and 3" (DN80). The SNT valve is designed in a standard angular connection form, ensuring a smooth and uniform fluid flow. Additionally, through-way type stop valves are available. Depending on the control requirements, they can be configured as manual, pneumatic, or electric. For precise throttling control, we utilize the Fluent-Code from Computational Fluid Dynamics to simulate and analyze the flow channel and its pressure drop, based on the SNT's internal design structure. To combat abrasion and corrosion due to high pressure drops and flow rates, all SNT internal components are usually surface-hardened with premium Co-Ni-based alloys or treated with Cr-N ceramic coatings, ensuring unmatched durability and longevity.



 

Product Description

SNT: Your trusted partner in providing high-quality, reliable, and innovative machinery solutions tailored to meet the demanding needs of modern industry. - SERIES DRAIN VALVE: Introducing our state-of-the-art series of drain valves, designed to ensure optimal performance and longevity for your applications.
3/4"(DN20)~3"(DN80) ANSI Class 150~1500: A versatile range of sizes and ANSI classifications to meet various operational requirements and ensure compatibility with diverse systems.
 

^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:
1. S101 hard surface technical description: Featuring a hardness of HRC≥55 and a robust metallurgical combination, this surface is designed to withstand wear and is not prone to falling out.
2. S503 hard surface technical description: With a thickness of 1.5mm and a hardness of HRC≥55, this surface offers a binding force of 400MPa, ensuring it remains intact with prolonged use.
3. S505 hard surface technical description: This surface boasts a thickness of 0.3mm, an impressive hardness of HRC≥65, and a binding force ≥250MPa, providing exceptional durability and performance.</sup>



Rated flow coefficient comparison table: An essential tool for evaluating and comparing the efficiency of various valve configurations to ensure optimal selection for your specific needs.



Application of Typical Working Conditions: Understand the myriad applications of our valves, designed to excel under a wide range of operational environments and conditions.
 

^{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. These configurations are crucial for maintaining efficient and safe boiler operations.}

<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. This setup ensures robust control and safety in boiler systems.

The intermittent drain valve usually adopts the lever type rapid discharge mechanism, which can realize the rapid opening and closing. Its design ensures that sediments and impurities are expelled efficiently, maintaining system integrity. When the valve is opened, the sediment, dirt, and other particles at the bottom of the boiler can be discharged quickly, in less than 3 seconds, minimizing water loss and enhancing resource efficiency. The flow channel mimics a straight pipeline for effective discharge.

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. This safeguard measure is vital for maintaining operational safety and preventing unnecessary resource expenditure.</sup>

Conditions&Solutions

Pressure and Temperature Parameters

SNT Valve Advantages

 

^{1. SNT Machinery (Qingdao) Co., Ltd. stands as a comprehensive, industry-leading enterprise that seamlessly integrates design, development, production, sales, and service, all within an innovative framework that harmonizes industry and trade.}

<sup>2. Experience exceptional quality, competitive pricing, and outstanding service delivered by a team of professional workers dedicated to providing creative solutions to all challenges.
3. Manufacturing Excellence: Obtain Special Equipment Type Test Certificates that underscore our commitment to quality and reliability.</sup>

^{4. Rigorously adhering to ISO9001 and API SPECQ standards, our company meticulously develops and implements essential control methods, processes, and equipment, including inspection and testing apparatus. This ensures that all aspects of design, manufacturing, inspection, testing, installation, and service are seamlessly compatible and complete within the entire system.}

<sup>5. Our exceptional research and development team boasts nearly 100 patents, showcasing our relentless pursuit of innovation and technological advancement.
6. SNT excels as a specialized enterprise in providing integrated solutions for control valves and associated actuators, serving key industries such as petroleum, chemical, power, storage tank, air separation, coal chemical, and liquefied natural gas.</sup>

 

Production application

 

 

Company Profile