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ZSXDF Series Cast Iron Rubber Seat Butterfly Valve

 

1. Product Name & Positioning

 

Full Name: CA-Fire ZSXDF Series CCC & ISO Certified Cast Iron Rubber Seat Butterfly Swing Check Valve (Stainless Steel Component, Water/Foam/Gas Compatible)

Abbreviation: CA-Fire ZSXDF Butterfly Valve

Core Positioning: A specialized anti-backflow valve for fire pipelines-fundamentally different from our previous control valves (e.g., wet alarm valves for flow control),water dividers (for flow distribution) and gate valves (for on-off adjustment). It uses a swing-type butterfly disc to block reverse water/gas flow, designed specifically for scenarios where backflow would damage systems (e.g., fire pump outlets, foam mixture pipelines). With cast iron durability + rubber seat sealing, it balances low flow resistance,multi-medium compatibility and reliable one-way control-ideal for safeguarding fire system integrity globally.

 

2. Core Product Advantages

 

1. Swing Butterfly Structure: Low Flow Resistance + Fast Anti-Backflow

Unlike gate valves (high flow resistance due to linear disc movement) or traditional lift check valves (slow response), this butterfly check valve features a swing-type butterfly disc:

Low flow resistance: The disc swings parallel to flow direction when media passes, with a pressure loss of <0.03MPa (1.6MPa working pressure)-30% lower than gate valves, ensuring no pressure drop for fire sprinkler systems.

Instant anti-backflow: When media reverses, the disc swings shut under gravity + reverse pressure in ≤1 second-faster than lift check valves (2–3 seconds), preventing backflow-induced damage to fire pumps or contamination of clean water pipelines.

2. Rubber Seat Sealing: Zero Leakage + Wear Resistance

A key design not found in cast iron gate valves (metal-to-metal sealing) or water dividers (no anti-backflow seals):

The butterfly disc is fitted with a nitrile rubber seat that compresses tightly against the valve body when closed, achieving zero leakage (passes 3.2MPa sealing test)-critical for foam mixture pipelines (leaks would reduce fire suppression efficiency).

Rubber seat has high wear resistance (service life ≥8 years),oil resistance and aging resistance-adapts to foam mixture's mild chemical properties (gate valves' metal seals may corrode in foam environments).

3. Multi-Medium Compatibility (Water/Foam/Gas)

Most fire valves (e.g., wet alarm valves,two-way dividers) only support water, but this check valve works with three media:

Water: For standard wet fire systems (e.g., residential building pipelines).

Foam mixture: For Class B fire (oil/chemical) suppression systems (rubber seat resists foam's surfactant erosion).

Gas: For gas fire extinguishing auxiliary pipelines (e.g., CO₂ system pressure relief lines)-a versatility no other previously introduced valve has.

4. Cast Iron + Stainless Steel: Durability for Harsh Environments

Valve body: High-density cast iron (tensile strength ≥250MPa) with anti-rust epoxy coating-withstands outdoor humidity,industrial dust and minor impact (e.g., accidental collision during installation), same durability as water dividers but with anti-backflow function.

Butterfly disc: Stainless steel (304 grade) to avoid rust-induced jamming-critical for wet systems where cast iron discs might stick to the body after long-term water contact.

5. Short Lead Time & Cost-Effective Bulk Pricing

Fast delivery: 1–10 units take 15 days (vs. 35 days for water dividers), ideal for emergency system retrofits (e.g., fire pump replacement projects).

Bulk savings: ≥200 units cost $20/unit-43% cheaper than gate valves ($35/unit) and 56% cheaper than imported butterfly check valves ($45/unit), reducing large-project costs.

 

3. Detailed Technical Parameters (Highlight Anti-Backflow Features)

 

Parameter Category	CA-Fire ZSXDF Butterfly Check Valve
Core Function	Anti-backflow (one-way control)
Structure	Swing butterfly disc + rubber seat
Applicable Medium	Water, Foam Mixture, Gas
Nominal Diameter	DN50~DN250
Working Pressure	1.6MPa
Flow Resistance	<0.03MPa
Lead Time (1–10 units)	15 days

4. Applicable Scenarios (Leveraging Anti-Backflow Advantage)

 

Fire Pump Outlets: Prevents water from flowing back into pumps when they shut down-avoids pump impeller damage and negative pressure in pipelines (gate valves can't block reverse flow).

Foam Fire Systems: Blocks foam mixture from reversing into water tanks-prevents contamination of clean water (wet alarm valves lack anti-backflow capability).

High-Low Level Water Tank Connections: Stops water from flowing from high-level tanks to low-level tanks-ensures stable water supply for upper-floor sprinklers.

Gas Fire Extinguishing Auxiliary Pipelines: Blocks reverse gas flow (e.g., CO₂,IG541) to avoid pressure loss in extinguishing zones (traditional valves don't support gas media).

 

5. Frequently Asked Questions (FAQ) – Focus on Anti-Backflow Uniqueness

 

Can this valve replace a gate valve in fire pipelines?No-they have different functions: This valve only blocks backflow (can't control on-off); gate valves control on-off (can't block backflow). Most projects need both: Gate valve for main pipeline on-off + this check valve for anti-backflow (e.g., fire pump outlet: gate valve upstream + check valve downstream).

Why is it compatible with foam mixture while other valves aren't?The nitrile rubber seat resists foam's surfactant erosion-unlike gate valves' metal seals (which corrode) or wet alarm valves' EPDM seals (which swell in foam). It also has no dead corners where foam might accumulate (avoids clogging).

Does installation have direction requirements?Yes-it's a one-way valve: The valve body has a "flow direction" arrow (must align with media flow). Installing in reverse will cause failure to block backflow. We provide installation labels and diagrams to avoid misalignment.

How to maintain the rubber seat?Only annual inspection is needed: ① Check if the seat is cracked/aged (replace if needed); ② Clean debris on the butterfly disc (prevents jamming). No complex disassembly-maintenance workload is 50% less than gate valves (which need lubricating gears).

 

 

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