The AqMatic AquaMatic V42B-0021-00000 Diaphragm Valve is a 3/4-inch, normally open valve with position indicator and spring assist open functionality, designed for reliable flow control in water treatment and industrial fluid handling systems. Built with a female NPT threaded connection and cast iron body, this valve supports consistent operation in applications where maintaining open flow and monitoring valve position are critical.
Within the valve assembly, the diaphragm and internal components regulate flow while maintaining proper sealing during operation. The integrated position indicator provides visual confirmation of valve status, improving system monitoring and troubleshooting. The spring assist open configuration adds mechanical force beneath the diaphragm to help return the valve to the open position, particularly in low-pressure or self-draining systems. The V42 series y-pattern design features a large seat opening and high lift disc, allowing higher flow rates with reduced pressure loss while supporting smooth diaphragm movement and long-term reliability.
$330.53
| Part Number | 1077144 |
| SKU | V42B-0021-00000 |
| Model | 421 |
| Pipe Size | 3/4″ |
| Pipe Connection | Female NPT Threaded |
| Body & Cap Mat’l | Cast Iron – Red Primer |
| Valve Option | Normally Open, Position Indicator, Spring Assist Open |
| Seal/Diaphragm/Disk (kit suffix) | Buna / Buna / Buna (RA) |
| Internal Parts | Brass, Stainless Steel |
| Drill & Tap Bosses | None |
| Solenoid Option | None |
| Solenoid Feature | None |
| Approximate Ship Weight (lbs.) | 3.5 |
Normally Open Configuration: Maintains continuous flow under normal conditions and closes only when actuated.
Position Indicator Included: Provides visual confirmation of valve position for improved system monitoring and diagnostics.
Spring Assist Open Functionality: Adds mechanical force to ensure reliable return to the open position in low-pressure or self-draining systems.
Y-Pattern Valve Design: Large seat opening and high lift disc provide higher flow rates with reduced pressure loss.
Durable Material Construction: Cast iron body with brass, stainless steel, and Buna-N components supports long-term performance.
Threaded NPT Connection: 3/4-inch female threaded connection allows for secure installation in standard pipeline systems.
Serviceable In-Line Design: Internal components can be maintained or replaced without removing the valve from the system.
| Weight | 4.0 lbs |
|---|---|
| Dimensions | 9 × 7 × 5 in |
