USER INSTRUCTIONS
Anchor Darling 1888-lb. Double-Disc Gate Valve |
Installation |
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½" through 2" Valves with 10" Manual Tee Handles |
Operation |
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Maintenance |
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FCD ADENIM0001-00 |
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Experience In Motion
1888-lb. Double-Disc Gate Valve FCD ADENIM0001-00
Table of Contents
1.0 |
Physical Description and Operation of Equipment |
8.0 |
Periodic In-Service Testing Recommendations |
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and Procedures |
2.0 Design Conditions
9.0
3.0 Operating Conditions
10.0
4.0 Test Conditions
11.0
5.0 Operating Precautions and Limitations
12.0
6.0 Installation Instructions
13.0
7.0 Maintenance Requirements
Maintenance Instructions
Storage Requirements
Bolting Torque Values
Reference Drawings
Customer-Certified Assembly Drawing(s)
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1888-lb. Double-Disc Gate Valve FCD ADENIM0001-00
Revision Sheet
Revision |
Date |
Changes |
Description |
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02/03/2004 |
Original Issue |
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1888-lb. Double-Disc Gate Valve FCD ADENIM0001-00
1.0 PHYSICAL DESCRIPTION AND OPERATION OF EQUIPMENT
1.1Double-Disc Gate Valves
The double-disc design is unique in that there are two independent discs. During each closing stroke, immediately prior to the disc seating, each disc rotates a few degrees in the plane of the seats. This rotating feature allows the disc to seat in a different position on each closing stroke, providing for equal wear and preventing small imperfections from being agitated into major leakage problems.
The wedge assembly is designed to impart sufficient thrust to each disc to maintain acceptable low-pressure seat leakage. As the differential pressure across the disc increases, the seating load also increases, thus maintaining acceptable leakage through the entire range of operating differential pressures. Since the discs are completely independent of each other and the design is essentially symmetrical, zero leakage can be maintained in either direction, depending only on the direction of flow. This feature eliminates the necessity of installing a check valve to stop reverse flow.
To operate these manual valves, turn the tee handle in a clockwise direction for closure and counterclockwise for opening.
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1888-lb. Double-Disc Gate Valve FCD ADENIM0001-00
2.0 DESIGN CONDITIONS
Refer to the applicable drawing(s) in Section 13 of this manual.
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1888-lb. Double-Disc Gate Valve FCD ADENIM0001-00
3.0 OPERATING CONDITIONS
Refer to the applicable drawing(s) in Section 13 of this manual.
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1888-lb. Double-Disc Gate Valve FCD ADENIM0001-00
4.0TEST CONDITIONS
4.1Each valve covered by this manual has received the following hydrostatic tests with no measurable leakage
4.1.1A shell hydrostatic test at 1.5 times the 100°F pressure rating.
4.1.2A seat leakage and disc closure test at 110% of the 100°F pressure rating.
4.1.3A backseat leakage test at 110% of the 100°F pressure rating.
4.1.4A packing test at 110% of the 100°F pressure rating.
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1888-lb. Double-Disc Gate Valve FCD ADENIM0001-00
5.0OPERATING PRECAUTIONS AND LIMITATIONS
5.1 Maximum hydrostatic test pressure shall not exceed the values imposed by the ASME Code, Section III.
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