AquaMatic V42 Diaphragm Valve
Durable AquaMatic V42 diaphragm valve (¾”–6″) with cast iron or brass body, high flow capacity, and adaptable options for water or air systems.
Since 1991 – Trade-Only wholesale partner

Durable AquaMatic V42 diaphragm valve (¾”–6″) with cast iron or brass body, high flow capacity, and adaptable options for water or air systems.
The AquaMatic V42 is a high-performance “Y” pattern diaphragm valve designed for reliable service in a wide range of water and air applications. Available in sizes from ¾” to 6″, the V42 is constructed with a cast iron or cast brass body and cap, stainless steel and Nitrile elastomer components, providing exceptional durability and long service life.
Its design features a large seat opening and high-lift disc for superior flow rates at lower pressure loss, while separate flow and control chambers allow positive closing without springs. For added versatility, spring assist options are available for low-pressure and self-draining systems.
The V42 is fully adaptable with accessories such as position indicators, adjustable flow limit stops, and high-temperature service kits, making it a flexible solution for both liquid and gas applications.
Features & Benefits
Large seat opening and high-lift disc for higher flow at lower pressure loss
Separate flow/control chambers ensure positive closing without springs
Cost-effective solution with low initial and maintenance costs
Serviceable in-line; diaphragm protected from flow stream
Constructed with cast iron, brass, stainless steel, and Nitrile elastomer components for long life
Sizes: ¾”–3″ threaded (NPT/BSP), 3″–6″ flanged ASA16.1 Class 125 or BSP4504
Compatible with air and water applications
Reinforced, stress-relieved diaphragms for reliability
Actuated with either air or water control fluid
Accessories: diaphragm/seal variations, spring assist, position indicator, limit stop, high-temperature service
| Valve type | “Y” pattern diaphragm valve |
|---|---|
| Sizes | ¾"–6" |
| Body/Cap | Cast iron or cast brass |
| Internal components | Stainless steel, Nitrile elastomers |
| End connections | Threaded (¾"–3", NPT/BSP), Flanged (3"–6") ASA16.1 Class 125 or BSP4504 |