AVK Donkin Softseal Gate Valve
Ductile iron flanged gas gate valve Kitemark™ approved to GIS/V7-1. Temperature -10°C to +60°C. MOP 7bar
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 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 555/401-003 | |
|---|---|
| Connection: | Flanged |
| Material: | Ductile Iron |
| DN: | DN50 - DN300 |
| PN: | PN 16 |
| Closing direction: | Clockwise to Close |
Features
- Full double block and bleed 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
- Fasteners fully encapsulated and sealed with hot melt
- Clear bore for under pressure drilling operations
- Suitable for end of line service
- Integral lifting lugs on valves 25kg+
- Stem seal replaceable under pressure
- Profiled ‘O’ ring body/bonnet joint
- Stainless steel spindle (standard)
- Embodied carbon data available upon request
- Option: >98% hydrogen* ready variants available (555/405) & Firesafe variant available (555/401-004)
Downloads
Reference nos. and dimensions:
| Ref. no. | DN mm |
BR DN |
H3 mm |
L mm |
W mm |
Turns to open |
Theoretical weight/kg |
|---|---|---|---|---|---|---|---|
| 555-050-04-011503 | 50 | Rp1/2 | 329 | 178 | 152 | 9 | 13 |
| 555-080-04-011503 | 80 | Rp1/2 | 409 | 203 | 190 | 12.5 | 21 |
| 555-100-04-011503 | 100 | Rp1/2 | 449 | 229 | 229 | 15.5 | 26 |
| 555-150-04-011503 | 150 | Rp3/4 | 564 | 267 | 279 | 14.5 | 45 |
| 555-200-04-011503 | 200 | Rp3/4 | 680 | 292 | 343 | 20 | 69 |
| 555-250-04-011503 | 250 | Rp3/4 | 880 | 330 | 442 | 24 | 127 |
| 555-300-04-011503 | 300 | Rp3/4 | 996 | 356 | 483 | 28 | 165 |
Components
| 1. | Bonnet | Ductile iron GJS-500-7 |
| 2. | Wedge | Cast iron GJL-250 |
| 3. | Gland | Ductile iron GJS-500-7 |
| 4. | Spindle | Stainless steel 420 |
| 5. | Seal | NBR rubber |
| 6. | Bush | POM |
| 7. | Thrust collar | Brass CZ132 |
| 8. | Screw | Steel 8.8 |
| 9. | Screw | Steel 8.8 |
| 10. | Seal | NBR rubber |
| 11. | Wiper ring | NBR rubber |
| 12. | Seal | NBR rubber |
| 13. | Body | Ductile iron GJS-500-7 |
| 14. | Pressure relief plug | Steel |
| 15. | Seal | NBR rubber |
| 16. | Seal | NBR rubber |
Test/Approvals
-
Tested according to EN12266-1. Seat: 1.1 x PN (in Bar), Body: 1.5 x PN (in Bar)
- CE marked according to Pressure Equipment Directive
- UKCA marked according to Pressure Equipment Regulations
- Approved according to Kitemark™ GIS/V7-1 (and PP1547 for hydrogen approved variants), KM 518241
Standards
- BGE/S/V/3, EN 12266, GIS/V7 Part 1
- Face to face according to EN 558 Table 2 Basic Series 3
- Flange Drilling according to EN1092-2
