High Pressure & Temperature Boiler Blow-Down Valves - DN50 Angle Type

• 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 beacon in the realm of valve manufacturing. Specializing in pioneering the development, innovative design, and meticulous production of advanced fluid flow and state-of-the-art valve technology, SNT is synonymous with excellence and reliability.

SNT The SNT drain valve transcends traditional applications with its versatile utility across a spectrum of demanding scenarios. Its prowess is showcased in continuous throttling control, making it the ideal choice for boiler continuous drain, high-pressure vessel and reactor sampling, high-pressure discharge, and the efficient operation of boiler feed pump bypass system release devices. Confronting high-pressure difference conditions, it adeptly handles pressure release scenarios. Furthermore, it proves indispensable in heater drain to condenser processes, adept at tackling corrosion and high flow rate flash conditions. Compared to conventional valves, the SNT valve is engineered for robustness and longevity, navigating continuous drain environments that pose serious threats to ordinary valves. The heightened flow rates and severe erosion in such settings render traditional cutoff drain valves, and even venturi valves, vulnerable, whereas the SNT valve stands resilient.

The SNT drain valve shatters conventional internal structural design paradigms. With an innovative approach, the flow channel between the valve core and cylindrical valve seat is artfully crafted with a sleek, smooth design that accelerates fluid dynamics. As the fluid surges past the valve seat to a suddenly expanded chamber, the pressure drop fosters rapid fluid expansion towards the flow's center. Concurrently, the fluid's energy disperses swiftly, transforming into a turbulent state, encouraging steam formation in supersaturated conditions. This process simultaneously cools any remaining liquid, exemplifying the efficient use of flash evaporation in liquid flows.

To cater to the diverse spectrum of device requirements, we expertly manufacture valves within the pressure domains of ANSI 150 to ANSI 2500. The standard stop valve dimensions commence at 3/4" (DN20), 1" (DN25), 1.1/2" (DN40), 2" (DN50), 2-1/2" (DN65), and culminate at 3" (DN80). The quintessential form of an SNT valve is its angular connection, designed for seamless, uniform fluid flow. Alternatively, through-way type stop valves are also on offer. These valves, according to control preferences, are available in manual, pneumatic, and electric variations. For refined throttling control, SNT employs the sophisticated Fluent-Code of computational Fluid Dynamics to simulate and scrutinize flow channels and pressure drops within its internal design structures. All SNT internals are typically surface-hardened with premium Co-Ni based alloys or treated with Cr-N ceramic coatings, safeguarding against abrasion and corrosion induced by significant pressure drops and accelerated flow rates.



 

Product Description

SNT - SERIES DRAIN VALVE
Available in sizes ranging from 3/4" (DN20) to 3" (DN80), the ANSI Class ranges from 150 to 1500, ensuring reliability and adaptability for various pressure requirements.
 

^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: Achieve a robust hardness of HRC≥55 with a metallurgical combination that is durable and resistant to dislodging.
2. S503 Hard Surface Technical Description: Engineered with a 1.5mm thickness and a remarkable hardness of HRC≥55, it boasts a binding force of 400MPa, making it exceptionally durable and resistant to separation.
3. S505 Hard Surface Technical Description: Features a precise 0.3mm thickness with enhanced hardness of HRC≥65 and a binding force of ≥250MPa, ensuring superior performance.</sup>



Rated Flow Coefficient Comparison Table



Application of Typical Working Conditions
 

^{As illustrated in the figure to the left, in accordance with ASME B31.1 Power Boilers and Piping standards, intermittent drain valves are typically deployed in Zone 2, being directly installed within the boiler or boiler piping. There are also continuous drain valves, traps, and safety valves, among others.}

<sup>As per §122.1.4 of ASME B31.1 Power Boilers and Piping, the piping is often equipped with two valves in series: a Y-type intermittent drain valve and an emergency stop valve.

The intermittent drain valve utilizes a lever-type rapid discharge mechanism to facilitate swift opening and closing. Upon activation, the valve swiftly expels sediment, dirt, and particles from the boiler base in under 3 seconds. Prolonged operation can result in excessive boiler water discharge, leading to significant resource wastage. The flow channel aligns closely with the straight pipeline.

The emergency stop valve serves to achieve a stringent pipeline cut-off, 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. is a comprehensive enterprise expertly involved in the design, development, production, sales, and service of industry-leading machinery, seamlessly integrating trade and innovation.}

<sup>2. We offer remarkable quality, competitive pricing, and unmatched service, delivered by professional workers equipped with innovative solutions to address any challenge.
3. Manufacturing Excellence with Special Equipment Type Test Certificates.</sup>

^{4. In compliance with ISO9001 and API SPECQ standards, we meticulously establish and implement essential control methods, processes, and equipment (including inspection and testing tools) to ensure harmonious integration of design, manufacturing, inspection, testing, installation, and service within the entire system, assuring their comprehensive effectiveness.}

<sup>5. Backed by an exceptional research and development team, boasting nearly 100 patents, we consistently drive innovation forward.
6. SNT excels as a specialized enterprise in delivering integrated solutions for control valves and their associated actuators, serving the petroleum, chemical, power, storage tank, air separation, coal chemical, and liquefied natural gas industries with unparalleled expertise.</sup>

 

Production application

 

 

Company Profile