Integral Block & Bleed Monoflange Needle Valve -- SS316
Monoflange Process Instrument Isolation and Bleed Valve
Document No.SV-DS-MNF-005
RevisionRev A
DateMay 2026
ManufacturerSupreme Valves India, Ahmedabad, Gujarat, India
This datasheet covers integral monoflange block and bleed needle valves in SS316 forged barstock for direct mounting between process flanges and instrument flanges, replacing traditional root valve assemblies.
Technical Specifications
| Parameter | Specification |
|---|
| Size Range | 1/2" to 1" process flange x 1/2" instrument connection |
| Pressure Rating | Class 150 to Class 1500 / PN16 to PN100 / 6,000 PSI |
| Body Material | SS316 forged barstock, one-piece monoflange body |
| Valve Configuration | One block needle valve + one bleed needle valve |
| Needle Tip | SS316 non-rotating Vee-point tip on both valves |
| Seat Material | Integral SS316, matched-lapped |
| Temperature Range | -73°C to +538°C (graphite packing) |
| Connections | Process: 1/2" to 1" flanged ASME B16.5 or RF/RTJ; Instrument: 1/2" NPT female |
| Mounting | Direct bolted between process nozzle flange and instrument flange |
| Handle | SS304 knurled handwheel standard |
| Features | Monoflange replaces root valve assembly, non-rotating tip, blow-out proof, flanged process connection |
Materials of Construction
| Component | Material |
|---|
| Body | SS316 forged barstock monoflange with integral process flange, valve chambers, and instrument connection |
| Needle | SS316 hardened non-rotating Vee-point tip on both block and bleed valves |
| Stem | SS316 anti-blow-out stem with ACME threads and thrust collar on both valves |
| Packing | PTFE V-rings (standard) or graphite braided (high temperature) |
| Gland Nut | SS316 hex gland nut |
| Bonnet | SS316 threaded or union bonnet |
| Flange Facing | Raised face (RF) or ring-type joint (RTJ) per ASME B16.5; flange finish 125-250 AARH |
| Studs / Nuts | B8M Class 2 studs with 8M heavy hex nuts for SS316 service |
Testing & Inspection
| Test | Requirement |
|---|
| Test Standard | Hydrostatic 1.5x rated pressure per API 598 / MSS SP-99 |
| Certification | CE, PED, ISO 9001, NACE MR0175 on request |
Applicable Standards
| Standard | Description |
|---|
| Design Standard | ASME B16.34 / MSS SP-99 / ASME B16.5 flange dimensions |
Notes
- Monoflange process flange must match nozzle flange class and facing (RF or RTJ); confirm nozzle specification at order.
- Standard instrument connection is 1/2" NPT female; alternative 1/2" tube compression or 1/2" socket weld available on request.
- Monoflange is not a pressure-boundary flange; process-side bolting must still meet piping code requirements for nozzle and gaskets.
- For high-vibration service (compressors, pumps), specify locking handles and anti-vibration transmitter mounting bracket.
- NACE MR0175 compliant version available for sour gas; specify H2S partial pressure and CO2 content at order.
