Industrial sourcing guide
Monoflange Valve Procurement Guide
Monoflange valves reduce connection points around instrument take-offs by combining flange mounting with isolation and bleed functions. This guide explains the details needed for a useful monoflange RFQ.
Monoflange arrangements
A monoflange may be a single isolate design, isolate-and-vent design, or double block and bleed arrangement. The right selection depends on process safety, maintenance philosophy and instrument hook-up requirements.
- Single isolate monoflange
- Block and bleed monoflange
- Double block and bleed monoflange
- Flanged direct-mount instrument isolation
RFQ details to define
Share flange size, flange class, facing, material, bore, valve type, bleed port, instrument connection, pressure rating, media, temperature and documentation requirements.
Where monoflanges help
Monoflanges are useful when space, weight and leak paths must be reduced around pressure instruments, sample points and compact process take-offs.
Frequently asked questions
Is a monoflange the same as a DBB valve?
Not always. A monoflange is a compact flange-mounted assembly. Some monoflanges are DBB designs, while others are single isolate or block and bleed arrangements.
What connection details are needed for monoflange valves?
Flange size, pressure class, facing, process side details, instrument connection, bleed port and material are the main inputs.