Marine Duo Check Valve
Item | Description |
|---|---|
Product Name | Marine Duo Check Valve |
Certificates | ABS, LR, BV, DNV, RINA, CCS |
FOB Price | Get Latest Price Now |
Warranty | 12 months (unless otherwise specified) |
Place of Origin | China |
Overview
1. WORKING PRINCIPLE
The Dual Plate Check Valve employs two spring-loaded plates hinged on a central hinge pin. When the flow decreases, the plates close by torsion spring action without requiring reverse flow. This design offers the twin advantages of No Water Hammer and Non Slam simultaneously.
When the pump starts and the downstream flow creates the required pressure drop in the forward direction, the double doors will automatically open. When the pump stops and the flow ceases, the torsion of the spring will automatically close the double doors prior to flow reversal. This creates a positive shut-off against flow reversal and minimizes system surges and water hammer.
Key design features include:
Dual-plate design: Compact and lightweight for efficient seating, operation, and lower installation cost.
Independent springs with long legs: Prevent seat scrubbing and provide non-slam performance. The plate heel is lifted first by design to prevent seat wear.
Retainerless valve design: No body penetration for critical service applications.
Independent plate suspension: Assurance of non-slam performance with improved valve response and longer life.
The Dual Plate Check Valve is also referred to as a SILENT CHECK VALVE.
2. DESIGN & MANUFACTURING STANDARDS
Design Standard: API 594 Type A (Short face-to-face)
Testing Standard: API 598 / ISO 5208, Leakage Rate A
3. MATERIALS OF CONSTRUCTION
Standard Trim Configurations (API 594):
| TRIM NO. | NOMINAL TRIM | MATERIAL TYPE | BODY SEATING SURFACE | DISC SEATING SURFACE |
|---|---|---|---|---|
| TRIM NO. 1 | 13Cr | 11-13Cr | A217 CA15 | A217 CA15 |
| TRIM NO. 5 | Hard-faced | Co-Cr-A | Co-Cr-A | Co-Cr-A |
| TRIM NO. 8 | 13Cr and Hard-faced | 11-13Cr, Co-Cr-A | Co-Cr-A | A217 CA15 |
| TRIM NO. 10 | Type 316 | 13Cr-18Ni-Mo | A351 CF8M | A351 CF8M |
4. PRESSURE & TEMPERATURE RATINGS
Pressure-Temperature Ratings (Cast Iron Body – Example):
| TEMPERATURE (°C) | -29° ~ +66° | 93° | 107° | 121° | 135° | 148° | 162° | 178° |
|---|---|---|---|---|---|---|---|---|
| PRESSURE (bar) | 16.0 | 9.3 | 8.9 | 8.6 | 8.2 | 7.6 | 7.2 | 6.9 |
5. SIZE RANGE
| PARAMETER | RANGE |
|---|---|
| Nominal Size (DN) | DN50 ~ DN1500 (2" ~ 60") |
| Extended Range | Up to 88" (DN2200) available for specific applications |
6. DIMENSIONS & FLOW COEFFICIENT
TABLE 1 – TYPICAL DIMENSIONS (ASME CLASS 150)
| NOMINAL SIZE (NPS) | FACE-TO-FACE L (mm) | BODY O.D. D1 (mm) | WEIGHT (kg) |
|---|---|---|---|
| 2" | 60 | 120.5 | 4 |
| 3" | 73 | 152.5 | 7 |
| 4" | 73 | 190.5 | 11 |
| 6" | 98 | 241.5 | 19 |
| 8" | 127 | 298.8 | 36 |
| 10" | 146 | 362.0 | 61 |
| 12" | 181 | 432.0 | 119 |
| 14" | 184 | 476.0 | 131 |
| 16" | 191 | 540.0 | 180 |
