High Pressure Boiler Blow-Down Valves - Through Way Type DN25 ANSI2500

• 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., 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 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 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.</sup>



Comprehensive Rated Flow Coefficient Comparison Table



Applications 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.}

<sup>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.</sup>

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.}

<sup>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.</sup>

^{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.}

<sup>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.</sup>

 

Production application

 

 

Company Profile