Angle Type High Pressure Boiler Blow-Down Valves - DN25 Specifications

• 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. (commonly known as SNT) is a distinguished leader in the valve manufacturing industry, renowned for its expertise in the innovation, design, and production of sophisticated fluid flow and valve technologies.

SNT Our expertly engineered drain valve stands out in the market, offering superior adaptability for continuous throttling control. Perfect for applications such as boiler continuous drain, high-pressure vessel and reactor sampling, high-pressure discharge, boiler feed pump bypass system release device, and more. The SNT valve's robust construction is incomparable to traditional counterparts, making it the ideal choice for enduring the challenges posed by continuous drain conditions. Where conventional cutoff drain valves and even venturi valves falter due to high flow rates and erosion, the SNT valve excels, promising maximum durability and reliability.

The SNT drain valve revolutionizes traditional internal structure designs. The streamlined flow channel between the valve core and cylindrical valve seat accelerates fluid dynamics, leading to a sudden expansion chamber downstream. This strategic pressure drop causes rapid fluid expansion towards the flow center. As energy disperses swiftly, the fluid transforms into a turbulent state. This ingeniously efficient discharge process facilitates steam formation from supersaturated fluids, effectively cooling the remaining liquid-a quintessential application of flash evaporation in liquid flow systems.

To cater to diverse operational demands, we manufacture valves spanning the pressure spectrum 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). SNT valves are predominantly designed with an angular connection to ensure a uniform fluid flow. Nonetheless, through-way type stop valves are also available. Depending on operational control needs, options include manual, pneumatic, and electric controls. For precision throttling, the SNT's internally optimized structure is analyzed using the advanced Fluent-Code of Computational Fluid Dynamics. This simulation ensures accurate flow channel and pressure drop evaluations. To combat abrasion and corrosion due to high pressures and flow rates, all SNT valve internals are surface-hardened with premium Co-Ni based alloys or treated with state-of-the-art Cr-N ceramic coatings.



 

Product Description

SNT - A Mark of Quality - SERIES DRAIN VALVE
3/4"(DN20)~3"(DN80), ANSI Class 150~1500 - Versatile Range and Standards
 

^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>Important Notes:
1. S101 Hard Surface Technical Description: With an impressive hardness of HRC≥55 and a robust metallurgical combination, it is designed to resist wear and prevent detachment under demanding conditions.
2. S503 Hard Surface Technical Description: This surface features a thickness of 1.5mm, achieving a hardness of HRC≥55, and a binding force of 400MPa, ensuring durability and stability.
3. S505 Hard Surface Technical Description: With a sleek thickness of 0.3mm, it boasts a hardness of HRC≥65 and a binding force ≥250MPa, offering exceptional toughness.</sup>



Rated Flow Coefficient Comparison Table - Optimize Your Selection



Application in Typical Working Conditions
 

^{As depicted in the accompanying illustration on the left, adhering to ASME B31.1 Power Boilers and Piping standards, the use of intermittent drain valves is ideal in Zone 2, installed directly within the boiler or piping. Additionally, continuous drain valves, traps, and safety valves play crucial roles in system safety and efficiency.}

<sup>In alignment with §122.1.4 of ASME B31.1 Power Boilers and Piping, the piping system is optimally equipped with a series of 2 valves: a Y-type intermittent drain valve, coupled with an emergency stop valve for enhanced safety.

The intermittent drain valve incorporates a lever-type rapid discharge mechanism, facilitating swift, efficient opening and closing for optimal performance. Upon activation, the valve expels sediment, dirt, and other particulates from the boiler's base within a rapid 3-second timeframe, preventing excessive water loss and conserving resources. The flow channel is designed to resemble a straight pipeline for maximum efficiency.

The emergency stop valve ensures a precise cut-off in the pipeline, safeguarding resources should the prior intermittent drain valve encounter a malfunction, offering a reliable backup.</sup>

Conditions&Solutions

Pressure and Temperature Parameters: Discover the precise parameters of pressure and temperature that our Angle Type High Pressure Boiler Blow-down Valves are engineered to withstand. Ensure optimal performance and reliability with specifications that meet rigorous industrial standards.

SNT Valve Advantages

 

^{1. SNT Machinery (Qingdao) Co., Ltd. stands as a comprehensive industry powerhouse, adeptly weaving together design, development, production, sales, and service to form a robust trade-oriented enterprise.}

<sup>2. At SNT, we pride ourselves on delivering exceptional quality, competitive pricing, and outstanding service, all made possible by our team of professional experts who offer innovative solutions to any challenges that arise.
3. Our commitment to excellence is unwavering. We specialize in the manufacture of Special Equipment Type Test Certificates, ensuring each product meets stringent industry standards.</sup>

^{4. In adherence to ISO9001 and API SPECQ standards, we establish and implement essential control methods, processes, and equipment, including inspection and testing tools. This ensures our design, manufacturing, inspection, testing, installation, and service processes are fully integrated and flawless throughout the entire system.}

<sup>5. Our extraordinary research and development team is a beacon of innovation, boasting nearly 100 patented products that set new benchmarks in the industry.
6. SNT is a leading enterprise specializing in providing comprehensive and integrated solutions for control valves and their associated actuators, serving a wide range of industries, including Petroleum, Chemical, Power, Storage Tank, Air Separation, Coal Chemical, and Liquefied Natural Gas sectors.</sup>

 

Production application

 

 

Company Profile