Factory Selling Good Quality Promotional Wholesale Cast Iron for Quick Opening Drain Valve with Flange Connection

• Customization: Available
• Size: DN15-600
• MOQ: 1 Piece
• Model NO.: QDV-2505
• Connection: Flange Ends
• Working Temperature: -29-550 Degree
• Transport Package: Wooden Box
• Specification: 100*100*100
• Trademark: Yoonad
• Origin: China
• Production Capacity: 50000PCS/Year
• Package Size: 100.00cm * 100.00cm * 100.00cm

Product Description

Product Description

The quick blowdown valve is a critical industrial valve designed for rapid discharge of impurities, wastewater, and excess media in pipelines, boilers, pressure vessels, and process systems. With its full-port flow channel and fast-opening structure, it enables high-flow, instant discharge—effectively removing scale, rust, slag, and other solid contaminants generated during operation, as well as high-salinity wastewater formed by medium evaporation.

Crafted from durable materials such as cast steel (WCB), stainless steel (304/316L), and alloy steel (Cr-Mo), this valve offers strong adaptability to harsh working conditions including high temperature, high pressure, and corrosive media. Its internal components (disc/seat) are often made of wear-resistant materials like Stellite, ensuring reliable sealing and long service life even with abrasive impurities. Available in flanged, threaded, and welded connection types, it supports flexible installation for different on-site requirements.

Beyond impurity removal to prevent pipeline blockage and equipment wear, the quick blowdown valve plays a key role in optimizing medium quality, avoiding corrosion caused by contaminated fluids, and maintaining stable system operation. It also serves as an emergency solution for pressure relief and system emptying during maintenance, safeguarding industrial production safety and process continuity. Compliant with international standards ( DIN, ISO), it is widely applied in industries such as power generation, chemical engineering, petroleum, metallurgy, and water treatment—becoming an indispensable component for efficient and safe industrial operation.

Product Advantages

Rapid impurity discharge: High-flow channel design enables instant removal of scale, rust, and solid contaminants.

Wear-resistant performance: Stellite or stainless steel trim resists abrasion from abrasive media.

Broad working condition adaptability: Compatible with high temperature, high pressure, and corrosive media (via WCB/304/316L/alloy steel materials).

Reliable sealing: Metal/PTFE seal ensures no leakage after closure, protecting system integrity.

Flexible installation: Supports flanged, threaded, and welded connections for diverse on-site needs.

Simple operation: Fast-opening structure allows quick activation (manual/automatic options).

Low maintenance: Robust construction reduces repair frequency and downtime.

Optimizes medium quality: Removes wastewater and impurities to prevent system corrosion.

Emergency functionality: Enables rapid pressure relief and system emptying for maintenance safety.

Compliant with international standards: Meets DIN, ISO norms for interchangeability and reliability.

Compact structure: Space-saving design fits tight installation environments.

Long service life: Durable materials and anti-clog design ensure stable performance in harsh industrial settings.

How does valve work?

A quick blowdown valve operates on the principle of "rapid actuation, high-flow discharge, and reliable resealing." Under normal conditions, its valve disc is tightly sealed against the seat by spring force or actuator pressure to prevent medium leakage. When impurities (scale, rust) or wastewater need removal, manual operation (lever/handwheel) or automatic signals trigger the valve, opening the full-port channel in 1–3 seconds. System pressure drives the medium and contaminants to flow out quickly through the unobstructed channel. After discharge, the valve resets via spring force or reverse actuator power, restoring a tight seal for the system to resume normal operation.

Product Parameters

Basic Specifications    
Nominal Diameter (DN)    e.g., DN15, DN25, DN40, DN50, DN80, DN100
Nominal Pressure (PN)    e.g., PN16, PN25, PN40, PN64, PN100
Pressure Class    e.g., Class 150, Class 300, Class 600, Class 900
Working Temperature Range    e.g., -29℃~425℃ (WCB), -40℃~550℃ (Alloy Steel), -196℃~300℃ (316L)
Applicable Medium    Steam, Water, Industrial Wastewater, Oil, Chemical Fluid, Gas with Particles
Performance Parameters    
Maximum Allowable Working Pressure (MAWP)    Maximum pressure the valve can withstand under normal operating conditions
Flow Capacity (Cv/Kv Value)    e.g., Cv=5.2, Cv=10.5; Kv=4.4, Kv=8.9 (indicates high-flow discharge capability)
Opening Speed    Instant Open, 1-3 seconds, Fast-Acting (varies by operation type)
Closing Pressure    Pressure at which the valve disc reseats tightly after discharge
Leakage Class    Class IV, Class V, Class VI (compliant with ISO 4126-6 standard)
Operating Pressure Range    e.g., 0.6MPa~4.0MPa, 1.0MPa~6.4MPa (matches system working pressure)
Structure & Installation    
Body Material    WCB Cast Steel, 304SS, 316LSS, Cr-Mo Alloy Steel, Ductile Iron
Trim Material (Disc/Seat)    316SS, Stellite Alloy, PTFE, Brass, Bronze (wear-resistant & sealing-focused)
Connection Type    Flanged (PN/Class), Threaded (NPT/BSP), Welded (Butt Weld/Socket Weld)
Operation Type    Manual (Lever/Handwheel), Pneumatic Actuated, Hydraulic Actuated, Electric Actuated
Valve Structure    Full-Port Design, Fast-Opening Stroke, Eccentric Disc Structure
Seat Type    Metal-to-Metal Seal, Soft Seal (PTFE/Fluororubber)
Weight & Overall Dimension (L×W×H)    e.g., 10kg, 15kg, 220×160×280mm, 300×200×350mm (varies by DN/PN)
Flow Direction    Unidirectional

port size	DN15-600
structure	Other
type	quick drain valve
place of origin	China
	Jiangsu
application	General
customized support	OBM, ODM, OEM
power	Manual
model number	QDV-2501
brand name	Yoonad
media	water,oil,gas
temperature of media	High Temperature, Low Temperature, Medium Temperature, Normal Temperature
warranty	2 years
Body material	WCB
Medium	Water Oil Gas
Size	DN15-600
Usage	Quickly discharge impurities in the system
Working Temperature	-29-550 Degree
MOQ	1 Piece
Connection	Flange Ends
Packing	Wooden Box
Valve type	quick drain valve
Seal	Hard