Manual

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Manual No.

DDCV-OM2-1

14” and Larger Wafer and Lug Style

Dual Disc

Check Valve

Operation, Maintenance and

Installation Manual

INTRODUCTION.................................... 1

RECEIVING AND STORAGE ................ 1

DESCRIPTION OF OPERATION........... 1

INSTALLATION...................................... 2

VALVE CONSTRUCTION...................... 3

MAINTENANCE ..................................... 5

TROUBLESHOOTING ........................... 5

DISASSEMBLY...................................... 5

REASSEMBLY....................................... 5

PARTS AND SERVICE.......................... 6

WARRANTY........................................... 6

VAL-MATIC

VALVE AND MANUFACTURING CORP.

905 RIVERSIDE DR. ELMHURST, IL. 60126

TEL. 630 / 941-7600 FAX. 630 / 941-8042

Summary of content (7 pages)

PAGE 1
Manual No. DDCV-OM2-1 14” and Larger Wafer and Lug Style Dual Disc® Check Valve Operation, Maintenance and Installation Manual INTRODUCTION.................................... 1 RECEIVING AND STORAGE ................ 1 DESCRIPTION OF OPERATION........... 1 INSTALLATION...................................... 2 VALVE CONSTRUCTION ...................... 3 MAINTENANCE ..................................... 5 TROUBLESHOOTING ........................... 5 DISASSEMBLY ......................................
PAGE 2
14”-60” WAFER STYLE DUAL DISC® CHECK VALVE OPERATION, MAINTENANCE AND INSTALLATION INTRODUCTION This manual will provide you with the information to properly install and maintain the valve to ensure a long service life. The Dual Disc® Check Valve is ruggedly constructed with bronze or stainless steel trim to give years of trouble free operation. The valve should be installed in horizontal or vertical flow up pipes carrying clean water.
PAGE 3
INSTALLATION The installation of the valve is important for its proper operation. The flow arrow on the valve body or nameplate must point in the direction of flow when the system is in operation. The valve can be installed in horizontal or vertical lines with the flow up. Valves for air service (Series 8900) require special springs to allow full valve opening. The valve should be installed between standard flanges per ANSI B16.1 or AWWA C207. The gasket can be rubber or compressed fiber.
PAGE 4
VALVE CONSTRUCTION (14”- 30”) The standard check valve body (1) is constructed of cast iron. See the specific Materials List submitted for the order if other than standard iron construction. The internal metal components are bronze or stainless steel. The discs (2) and torsion spring (3) are the only moving parts and require no maintenance or lubrication. The general details of construction are illustrated in Figure 2.
PAGE 5
VALVE CONSTRUCTION (36”- 60”) The standard check valve body (1) is constructed of cast iron. See the specific Materials List submitted for the order if other than standard iron construction. The internal metal components are bronze or stainless steel. The discs (2) and torsion spring (3A and 3B) are the only moving parts and require no maintenance or lubrication. The general details of construction are illustrated in Figure 3.
PAGE 6
3. Drive out the pins (4 and 5) with a round bar or punch while pressing down on the spring (3) to prevent it from unwinding. Valve 18” and larger have 2 springs and require extreme care to prevent rapid uncoiling of the spring during disassembly. Restrain the spring with boards and clamps during disassembly. MAINTENANCE Dual Disc® Check Valves require no scheduled lubrication of maintenance.
PAGE 7
REASSEMBLY (Continued) PARTS AND SERVICE Parts and service are available from your local representative or the factory. Make note of the Valve Size and Model Number located on the valve nameplate and contact: 5. While pushing the pin further, install the third thrust bearing (6) and the fourth disc lug, and the fourth thrust bearing (6). The pin should now be centered in the body and the disc should rotate without binding. Val-Matic Valve and Manufacturing Corp.