The Castair BV75 is a 3/4" NPT-Female Full Flow Ball Valve specifically rated for use with 5-10HP rotary screw and reciprocating compressors. At the 5-10HP range, you're moving serious CFM through the discharge line, and undersized or restricted valves create back pressure that reduces system output and stresses pump components. The BV75's full-flow design means the internal bore matches the 3/4" pipe diameter — no restriction, no pressure drop through the valve body itself.
Key Features
- 3/4" NPT Female Threads (Both Ports): Standard NPT female on inlet and outlet — fits 3/4" NPT male fittings throughout
- Full Flow Ball Design: Internal bore matches 3/4" pipe ID — no constriction through the valve
- Rated for 5-10HP Rotary Compressors: Designed to handle the flow and pressure demands of compressors in this HP range
- Quarter-Turn Operation: 90-degree handle from fully open to fully closed — clear, definitive positions
- Heavy-Duty Commercial Construction: Cast Air quality for industrial-grade compressed air systems
Technical Specifications
- Part Number: BV75
- Port Size: 3/4" NPT Female (inlet and outlet)
- Valve Type: Full flow ball valve
- Operation: Quarter-turn (90°)
- Thread Standard: NPT (National Pipe Taper)
- Rated For: 5-10HP rotary compressors
- Manufacturer: Cast Air
- Pressure rating and body material — contact us for complete specifications.
Why Valve Sizing Matters on Rotary Compressors
Rotary screw compressors at 5-10HP run continuously under load. They're not like a reciprocating compressor that cycles on and off — they're pushing air constantly, and anything that restricts discharge flow creates back pressure across the entire system. A full-flow valve at 3/4" keeps the discharge path open. An undersized or restricted-port valve at this flow rate will cost you real CFM and can cause the compressor to run hotter and cycle the high-temp shutdown more frequently. The BV75 is sized for this application from the ground up.
Applications
- Compressor Discharge Isolation: Install between the compressor outlet and the receiver tank as the primary system shutoff
- Tank Outlet Valve: Shutoff at the tank outlet to the distribution header
- Service Isolation: Isolate the compressor for maintenance without depressurizing the entire distribution system (with a check valve in the circuit)
- Main Header Shutoffs: Zone shutoffs on 3/4" header lines serving multiple branch drops
- Bypass Lines: Full-flow valve in a compressor bypass circuit
Valve Selection by Compressor Size
- Under 3HP / Small Tools: 1/4" BV25M or 3/8" BV38 at the tool drops
- 3-5HP / Multiple Users: 1/2" BV50 on branch lines
- 5-10HP Rotary or Reciprocating: 3/4" BV75 at the compressor and main header
- Above 10HP: Contact us — larger header valves and system-specific selection applies
Why Buy From OEM Diagnostic Tools?
We stock Cast Air valves, fittings, and replacement parts for commercial and industrial compressed air systems. Specialist supplier since 2016. Free shipping on qualifying orders. Our team understands compressor systems — call us if you need help selecting valves for a new system build or identifying the right replacement for existing hardware.
Call 866-217-0063 for quick answers and help!
