AVK Donkin Softseal Gate Valve
Ductile iron flanged gas gate valve designed in accordance with GIS/V7-1. Temperature -10°C to +60°C. MOP 10bar (7bar with Kitemark)
The Mark 4 Series 555/401 Softseal Valve is a double-faced, resilient seat, internal screw, clear bore wedge gate valve. It is designed primarily for the isolation of natural gas and manufactured gas. Suitable for blended hydrogen*.
The Donkin 555 softseal gas valves are manufactured with the tried and trusted Donkin metallic wedge used for over 50 years on the gas networks. A true wedge design, the gate seals on both machined faces with an embedded nitrile seal in each face which sit completely outside the flow of gas with the valve open.
• The design gives effective and long term sealing on closure and the closing torques remain relatively low over the valve’s design life.
• The low closing / breaking torque means operators don’t risk over exertion / injury. Can be easily closed by a single person with standard equipment.
• Negates the need for manual handling risk assessment.
| Variant 555/401-001 | |
|---|---|
| Connection: | Flanged |
| Material: | Ductile Iron |
| DN: | DN50 - DN300 |
| PN: | PN 10 |
| Closing direction: | Clockwise to Close |
Features
- Full double block and bleed facility with pressure relieving plug.
- Soft seal positive shut off, metal to metal secondary seal.
- Maintenance free.
- Self supporting “flange feet” for ease of installation and stockholding. Integral lifting lugs on valves 20kg+.
- Fasteners fully encapsulated and sealed with hot melt.
- Profiled ‘O’ ring body/bonnet joint.
- Suitable for under pressure drilling and tapping operations. Suitable for end of line service.
- Flanged ASA150.
- Stainless steel spindle (standard)
- Twin pack black epoxy coating minimum 75 microns.
- Embodied carbon data available upon request.
- 25mm stem fitted as standard. Stem seal replaceable under pressure.
- Option: >98% hydrogen* ready variants available (555/405)
Downloads
Reference nos. and dimensions:
| Ref. no. | DN mm |
BR DN |
H3 mm |
HF mm |
L mm |
W mm |
Turns to open |
Theoretical weight/kg |
|---|---|---|---|---|---|---|---|---|
| 555-050-14-04130041 | 50 | Rp1/2 | 329 | 262 | 178 | 152 | 9 | 13 |
| 555-080-14-04130041 | 80 | Rp1/2 | 409 | 319 | 203 | 190 | 12.5 | 21 |
| 555-100-14-04130041 | 100 | Rp1/2 | 449 | 341 | 229 | 229 | 15.5 | 26 |
| 555-150-14-04130041 | 150 | Rp3/4 | 564 | 431 | 267 | 279 | 14.5 | 45 |
| 555-200-14-04130041 | 200 | Rp3/4 | 680 | 518 | 292 | 343 | 20 | 69 |
| 555-250-14-04130041 | 250 | Rp3/4 | 880 | 683 | 330 | 442 | 24 | 127 |
| 555-300-14-04130041 | 300 | Rp3/4 | 996 | 766 | 356 | 483 | 28 | 165 |
Components
| 1. | Body-bonnet seal | NBR rubber |
| 2. | Body | Ductile iron |
| 3. | Wedge | Cast iron |
| 4. | Gland | Ductile iron |
| 5. | Screw | Carbon steel |
| 6. | Cap | Cast iron |
| 7. | Seal | NBR rubber |
| 8. | Bush | PA |
| 9. | Thrust collar | Brass |
| 10. | Set screw | Carbon steel |
| 11. | Spindle | Stainless steel 420 |
| 12. | Seal | NBR rubber |
| 13. | Wiper ring | NBR rubber |
| 14. | Seal | NBR rubber |
| 15. | Seal | NBR rubber |
| 16. | Bonnet | Ductile iron GJS-500-7 |
| 17. | Pressure release plug | Carbon steel |
Test/Approvals
-
Tested according to EN12266-1. Seat: 1.1 x PN (in Bar), Body: 1.5 x PN (in Bar)
- Approved according to Kitemark™ GIS/V7-1 (and PP1547 for hydrogen approved variants), KM 518241
- CE marked according to Pressure Equipment Directive
- UKCA marked according to Pressure Equipment Directive
Standards
- GIS/V7 Part 1
- Face to face according to EN 558 Table 2 Basic Series 3
- Flange drilling to ANSI B 16.42, class 150
