Durable ANSI B16.34 Pn25 Petrochemical Backflow Prevention Cast Steel Lift Check Valve

Product Description

Product Description

Cast steel swing check valves are robust, automatic flow control devices engineered to prevent reverse flow in industrial pipelines. Constructed from high-grade cast steel—offering exceptional mechanical strength, durability, and resistance to moderate to high pressure and temperature—they excel in handling liquids, gases, and steam across diverse applications.

Featuring a hinged disc mechanism within a cast steel body, these valves operate passively without external controls. The disc is mounted on a hinge pin, allowing it to swing freely in the direction of forward flow. When media flows forward, pressure lifts the disc open, creating an unobstructed path for efficient passage. If flow reverses, gravity and reverse pressure drive the disc back onto a precision-machined seat, forming a tight, leak-tight seal to block backflow.

Designed for reliability and low maintenance, their simple structure minimizes wear and failure risks. Suitable for water treatment, petrochemical, power generation, and HVAC systems, these valves combine cast steel's ruggedness with automatic backflow prevention, ensuring pipeline integrity and operational safety.

DN	mm	15	20	25	32	40	50	65	80
L(RF)	mm	130	150	160	180	200	230	290	310
L1(BW)	mm	140	152	165	184	203	229	279	318
H	mm	100	105	120	130	135	149	154	169
WT(RF)	Kg	5.4	7	7.4	8.5	12.5	16	25	30
	RMB
DN	mm	350	400	450	500	600	700	800	900
L(RF)	mm	980	1100	1200	1250	1450	1650	1850	2050
L1(BW)	mm			-
H	mm
WT(RF)	Kg	-		-	-
	RMB
DN	mm	15	20	25	32	40	50	65	80
L(RF)	mm	130	150	160	180	200	230	290	310
L1(BW)	mm	152	178	203	216	229	267	292	318
H	mm	100	105	120	130	135	149	154	169
WT(RF)	Kg	5.4	8	8.4	9.2	13.5	17	26	31
	RMB
DN	mm	350	400	450	500	600	700	800	900
L(RF)	mm	980	1100	1200	1250	1450	1650	1850	2050
L1(BW)	mm
H	mm
WT(RF)	Kg
	RMB

Product Advantages

A – Automatic Backflow Prevention
Operates passively via media pressure and gravity, requiring no external controls. Instantly blocks reverse flow to protect pipelines, pumps, and equipment from damage or contamination.

B – Robust Cast Steel Construction
Crafted from high-grade cast steel, offering exceptional mechanical strength, impact resistance, and structural rigidity. Withstands moderate to high pressure, temperature fluctuations, and harsh industrial environments.

C – Consistent Leak-Tight Sealing
Hinged disc swings tightly against a precision-machined seat when closed. Ensures reliable sealing, preventing reverse media leakage and safeguarding system efficiency and operational safety.

D – Low Flow Resistance
The disc swings fully open to create an unobstructed, streamlined flow path. Minimizes pressure drop and energy loss, optimizing pipeline efficiency for smooth media passage.

E – Durable & Low-Maintenance Design
Fewer moving parts (hinged disc + pin) reduce wear and failure risks. Requires minimal upkeep, lowering long-term operational and replacement costs.

F – Versatile Media Compatibility
Handles liquids, gases, and steam across diverse industrial applications. Cast steel's corrosion resistance (with optional coatings) suits aggressive media like oils, chemicals, or process fluids.

G – Easy Installation & Integration
Compact, space-efficient design fits seamlessly into horizontal or vertical pipelines (with proper orientation). Simplifies installation and system upgrades without compromising performance.

How does valve work?

Cast steel swing check valves operate via a straightforward, automatic mechanism to prevent reverse flow in industrial pipelines. At their core is a cast steel body housing a hinged disc, mounted on a pin to swing freely in the direction of flow.

When forward flow occurs, media pressure (liquid, gas, or steam) pushes against the disc, lifting it open to create an unobstructed path. This allows efficient fluid passage with minimal pressure drop, as the disc swings fully to align with the flow direction.

If flow reverses, gravity and reverse pressure act on the disc, causing it to swing back into a closed position. The disc seats tightly against a precision-machined surface, forming a leak-tight seal that blocks backflow. This prevents damage to downstream equipment, pumps, or processes from contamination or pressure surges.

The valve requires no external controls, relying solely on media pressure and gravity for reliable, passive operation. Its robust cast steel construction and simple design ensure durability and low maintenance, making it ideal for water treatment, petrochemical, power generation, and HVAC systems.