High Pressure & Temperature Blow-Down Valves - Series Type DN80 with Carbon Steel Materials

• 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 the valve manufacturing industry. Our expertise lies in the innovative development, meticulous design, and top-tier production of advanced fluid flow and valve technology. Experience engineering excellence and precision with SNT, where every valve is a hallmark of quality.

SNT - A Symbol of Reliability and Innovation in Valve Technology Our cutting-edge drain valves are engineered for versatile applications that demand continuous throttling control. They excel in scenarios such as boiler continuous drainage, high-pressure vessel and reactor sampling, high-pressure discharges, and boiler feed pump bypass system releases. Perfect for high-pressure differential conditions and processes where heaters drain into the condenser, these valves withstand the corrosive and high-flow flash conditions that often compromise traditional valves. SNT valves redefine robustness and durability, making them the ideal choice for continuous drain conditions that typically challenge valve integrity. With high flow rates and severe erosion as common issues, traditional cutoff drain valves and even venturi valves fall short, whereas SNT valves stand resilient and robust.

The SNT Drain Valve: Redefining Valve Engineering with Advanced Design Our revolutionary drain valve breaks conventional internal design paradigms. The ingeniously smooth flow channel design between the valve core and the cylindrical valve seat accelerates fluid flow until it reaches the enlarged downstream chamber. This strategic pressure drop in the flow channel's core triggers rapid fluid expansion, converting energy quickly into a turbulent flow condition. This efficient discharge process ensures seamless steam formation from supersaturated liquid, simultaneously cooling the remaining fluid-a quintessential example of leveraging flash evaporation within liquid flow dynamics.

To cater to diverse device requirements, we offer a versatile range of valves spanning pressure ratings from ANSI 150 to ANSI 2500. Our standard stop valve dimensions include 3/4" (DN20), 1" (DN25), 1.1/2" (DN40), 2" (DN50), 2-1/2" (DN65), and 3" (DN80). The standard configuration of SNT valves features an angular connection, ensuring a smooth, uninterrupted fluid flow. Additionally, the through-way type stop valves are available to meet specific control needs. With options for manual, pneumatic, and electric controls, our valves offer precision throttling. Using advanced computational fluid dynamics and the Fluent-Code, we meticulously simulate and analyze the flow channel and its pressure drop within SNT's internal design. To combat high pressure drops and flow rates, all SNT internals are surface-hardened with premium Co-Ni based alloys or treated with Cr-N ceramic coatings, delivering unmatched abrasion and corrosion resistance.



 

Product Description

SNT - 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>Notes:
1. S101 hard surface technical description: A robust coating with HRC≥55, ensuring a metallurgical combination that is not prone to falling out.
2. S503 hard surface technical description: Features a thickness of 1.5mm, with a hardness of HRC≥55 and a strong binding force of 400MPa, designed to resist detachment.
3. S505 hard surface technical description: This features a slim thickness of 0.3mm and remarkable hardness of HRC≥65, with a binding force of ≥250MPa.</sup>



Rated flow coefficient comparison table



Application of Typical Working Conditions
 

^{As shown in the figure on the left, adhering to ASME B31.1 Power Boilers and Piping standards, these intermittent drain valves are typically deployed in Zone 2, seamlessly integrated into boiler or boiler piping. In addition to these, continuous drain valves, traps, and safety valves are also widely utilized.}

<sup>According to §122.1.4 of ASME B31.1 Power Boilers and Piping, the piping is generally equipped with a dual valve series, comprising a Y-type intermittent drain valve and an emergency stop valve.

The intermittent drain valve is engineered with a lever-type rapid discharge mechanism, facilitating swift opening and closing actions. When the valve is activated, the sediment, dirt, and any other particulates settled at the base of the boiler can be expeditiously expelled in under 3 seconds. Extending this time could lead to excessive boiler water discharge, culminating in substantial resource wastage. The flow pathway is designed to be as linear as possible, similar to a straight pipeline.

The emergency stop valve is implemented to ensure an absolute shut-off of the pipeline, preventing resource wastage in the event that the preceding intermittent drain valve encounters a malfunction.</sup>

Conditions&Solutions

Pressure and Temperature Parameters: Experience unprecedented performance with our advanced Blow-down Valves, expertly engineered to operate under high-pressure and high-temperature conditions. Trust in the Series Type DN80 to ensure optimal efficiency and safety in your operations.

SNT Valve Advantages

 

^{1. SNT Machinery (Qingdao) Co., Ltd. stands at the forefront as a comprehensive industry leader, seamlessly integrating design, development, production, sales, and service into one cohesive enterprise.}

<sup>2. Experience unrivaled quality, competitive pricing, and exceptional service, all delivered by our team of seasoned professionals who bring innovative solutions to every challenge.
3. A testament to our commitment to excellence. We proudly manufacture products that hold Special Equipment Type Test Certificates, affirming our dedication to quality and safety.</sup>

^{4. We adhere to the stringent standards of ISO9001 and API SPECQ, meticulously determining and preparing essential control methods, processes, and equipment-including inspection and testing tools-to ensure seamless compatibility and comprehensive integration of design, manufacturing, inspection, testing, installation, and service within the entire system.}

<sup>5. Our outstanding research and development team is a powerhouse of innovation, boasting nearly 100 patents that drive our product advancements.
6. SNT Machinery is a specialized enterprise delivering holistic solutions for control valves and their associated actuators, catering to diverse industries including Petroleum, Chemical, Power, Storage Tank, Air Separation, Coal Chemical, and Liquefied Natural Gas, among others.</sup>

 

Production application

 

 

Company Profile