Driving Innovation for a Brighter Future
At Dawsons-Tech, we believe in the power of continuous improvement to shape a better tomorrow.
Instrumentation Needle / Gauge /
Block & Bleed / Bleed Valves
Index
Series : NV101
Series : NV103
Series : NVD31
Series : NVD41
Series : VGR23
(With Live Load System)
(With Live Load System)
(For High Pressure 10,000 PSIG)
Series : VBL03
General Information
DAWSONS-TECH® offers most Cost-Effective Needle Valves, Gauge Valves, Block and Bleed Gauge Valves and Bleed Valves which have been design very carefully and manufactured to close tolerances to provide leak free performance for mounting on Pressure Gauges, Pressure Transmitters, Pressure Switches, etc.
Features / Benefits
- Compact and Rugged Design.
- Bar stock body in straight patterns.
- Low operating torque.
- Anti blow-out stem.
- Flow Coefficient (Cv) from 0.25 to 1.8.
- Orifice size : 4.3mm, 6.3mm and 9.5mm.
- Available in Material SS316, all wetted parts in accordance with NACE MR01-75.
- Available with Male, Female NPT, BSP, BSPT Pipe Thread, Socket Weld and Tube O.D. end connections.
- Every Valve is pressure tested.
Product Range & Operating Parameters :
- Pressure Rating : UPTO 6000 PSIG (413 Bar at CWP).
- Temperature Rating :
- -54°C to 232°C with PTFE Packing.
- -96°C to 426°C with Graphite Packing.
Applications :
- General Plant Services
- Hydraulic & Pneumatic
- Instrumentation Isolations
- Pressure Measurement Devices
- Venting
Ordering Information
For Example : Part No. NV101-FF8N-SSTNR (Needle Valves)
Valve Series | End Connection Type | End Connection Size | Pipe Thread Type | Material Of Construction | Packing Material | Stem Type |
| NV101 | FF | 8 | N | SS | T | NR |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
For Example : Part No. NVD31-FF8N-SSTNR (Bleeder Screw Gauge Valves)
Valve Series | End Connection Type | End Connection Size | Pipe Thread Type | Material Of Construction | Packing Material | Stem Type |
| NVD31 | FF | 8 | N | SS | T | NR |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Valve Series | End Connection Type | End Connection Size | Pipe Thread Type | Material Of Construction | Packing Material | Stem Type |
| VGR23 | FF | 8 | N | SS | T | NR |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
For Example : Part No. BBGV1-FF8N-SSTNR (Block & Bleed Manifold Valves)
Valve Series | End Connection Type | End Connection Size | Pipe Thread Type | Material Of Construction | Packing Material | Stem Type |
| BBGV1 | FF | 8 | N | SS | T | NR |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
For Example : Part No. VBL03-M8N-SS (Bleed Valves)
Valve Series | End Connection Type | End Connection Size | Pipe Thread Type | Material Of Construction |
| VBL03 | M | 8 | N | SS |
| 1 | 2 | 3 | 4 | 5 |
| 1) | Valve Type | Series |
| Needle Valve | NV101 | |
| NV103 | ||
| NV107 | ||
| NV109 | ||
| Bleeder Screw Gauge Valves | NVD31 | |
| Bleeder Screw Gauge Valves | NVD41 | |
| Gauge / Root Valve | VGR23 | |
| Block & Bleed Manifold Valve | BBGV1 | |
| Bleed Valve | VBL03 |
| 2) | End Connection Type | TT : Tube OD x Tube OD |
| FF : Female x Female | ||
| MM : Male x Male | ||
| MF: Male x Female | ||
| FM : Female x Male | ||
| SW : Socket Weld | ||
| MSN : Male x Swivel Nut |
| 3) | End Connection Size Tube Fittings | |||
| Fractional Tube | Metric Tube | |||
| 4 | 1/4″ | 6M | 6MM | |
| 6 | 3/8” | 8M | 8MM | |
| 8 | 1/2″ | 10M | 10MM | |
| 12 | 3/4″ | 12M | 12MM | |
| 16 | 1” | 22M | 22MM | |
| 25M | 25MM | |||
| Pipe End Connection Size | Fractional | |||
| 4 | 1/4″ | |||
| 6 | 3/8” | |||
| 8 | 1/2″ | |||
| 12 | 3/4″ | |||
| 16 | 1” | |||
| Metric | ||||
| 20M | M20 x 1.5 | |||
| 22M | M22 x 1.5 | |||
| 4) | End Connection Thread Type | N : NPT (Male / Female) |
| RT : BSPT (Male / Female) | ||
| RG : BSP (Female) | ||
| G : BSP (Male x Female) |
| 5) | Material | SS : SS316 |
| SSL : SS316L | ||
| CS : Carbon Steel |
| 6) | Packing Material | T : PTFE |
| G : Graphite | ||
| V : Viton | ||
| F : Aflas |
| 7) | Stem Type | NR : Non-Rotating |
| VS : ‘V’ Stem | ||
| SF : Soft Seat Stem | ||
| RS : Regulating Stem |