Overview
The Flowserve 4446PMSE.075 is a compact, three-piece industrial ball valve designed for reliable fluid and gas flow control in demanding applications. Manufactured by Flowserve (which includes the Worcester Controls product line), this 3/4-inch NPT-threaded valve combines carbon steel body durability with stainless steel internals, rated for 1480 PSI working operating gauge (WOG) pressure. The reduced-port design and manual lever handle provide straightforward operation and maintenance in confined spaces.
Key Features
- 3/4″ NPT threaded connections — Standard female NPT inlets/outlets for direct pipeline installation
- 1480 PSI WOG rating — Heavy-duty industrial pressure capacity for oil, water, gas, and compressed air systems
- Three-piece construction — Separable design enables on-site repair and ball/seat replacement without line shutdown
- Carbon steel body with stainless steel ball and stem — Corrosion resistance and structural strength for long service life
- Polyfill seats with PTFE coating — Reliable sealing across temperature ranges; reduced friction lever operation
- Reduced-port design — Compact form factor suited for space-constrained installations and manifold blocks
Technical Specifications
The following specifications are based on distributor and manufacturer product documentation:
- Port Size: 3/4″ NPT (female)
- Pressure Rating: 1480 PSI WOG
- Body Material: Carbon Steel (CS)
- Ball Material: Stainless Steel (316)
- Stem: Stainless Steel (316)
- Seats: Polyfill with PTFE coating
- Seals: PTFE-coated metal seals
- Configuration: 3-Piece, Reduced Port
- Connection Type: NPT Threaded
- Handle: Manual Lever (standard)
- Applicable Fluids: Oil, water, gas, compressed air, steam (verify fluid compatibility at installation)
Typical Applications
The Flowserve 4446PMSE.075 is widely used in:
- HVAC systems — Chiller isolation, water loop shutoff, and hot/cold line control
- Compressed air treatment — Dry-air systems, dryer bypass, and pressure regulation manifolds
- Hydraulic and pneumatic circuits — Directional control, load isolation, and test line shutoff
- Industrial plumbing — Water supply shutoff, boiler feed lines, and process water loops
- Oil and gas field equipment — Downhole and surface wellhead isolation
- Machinery and equipment manifolds — OEM-standard fit for industrial valve block assemblies
Compatibility & Replacements
Compatible With
- Standard 3/4″ NPT female threaded pipeline and manifold systems
- Flowserve Worcester Controls replacement parts ecosystem
- HVAC and industrial control modules requiring 1480 PSI isolation valves
- Compressed air treatment and drying systems
- Oil, water, gas, and steam service applications (fluid-dependent)
Replaces / Drop-In Replacement For
The 4446PMSE.075 directly replaces other 3/4″ NPT carbon steel ball valves in the Worcester Controls Series 44 lineup and equivalent Flowserve offerings. Related size variants include 4446PMSE.100 (1″ NPT) and 4446PMSEG (1″ NPT, full-port). Verify your current valve model and pressure rating before ordering — part number must match .075 designation for 3/4″ applications.
Works With
- Standard industrial piping systems (steel, stainless, copper)
- Pneumatic and hydraulic manifold blocks
- HVAC water loop and chiller systems
- Compressed air treatment and conditioning systems
- Industrial control and instrumentation panels requiring manual isolation valves
