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Tyre Industry What is the main difference between piston valve and globe valve
A disk-shaped plug that fits into the spherical body of a globe valve regulates the flow of fluid through the valve. A piston-shaped plug that fits into the cylindrical body of a piston valve regulates the flow of fluid through the valve.
Following are the the main difference between piston valve and globe valve:
| No. | PISTON VALVE | GLOBE VALVE |
| 1. | Seatless Glandless Sealing Area- Relatively Large. i.e. inner surface of ring. | Seat at bottom, Gland with Stuffing Box. Reduced Sealing Area i.e. area between disc & seat. |
| 2. | No Leak across the ports. | Leakage across the ports very common. |
| 3. | Piston-Unexposed to Media. Non-Abrasive Foreign matters are swept away by descending Piston. Valve Rings are resilient. No erosion of pistion “ DURABILITY” | Seat & Disc constantly exposed to Media. Solid particles remain on seat & disc & seat are metallic. Erosion of disc & seat – VERY COMMON |
| 4. | Special Klinger Design Belleville Washer with rings produces spring action. Stays tight during thermal expansion. | Conventional Valve Design. Chattering between disc & seat very common. Leakage during thermal expansion. |
| 5. | No Leakage of Toxic / aggressive Media | Loss of fluid due to leakage. |
| 6. | Energy & Cost Saving | Leakage costly & Hazardous |
| 7. | Replacement of Rings makes valve new. No-Lapping / Grinding .Valve remains online during maintenance. | Seat & Disc call for lapping / grinding valve to be removed from the line. |
| 8. | Maintenance cost “NEGLIGIBLE” | Maintenance not only costly but time consuming too. |
For working of pistion valve: UKL Piston Valves