Flowserve Swing Check Valves 2.5-24 User Manual

Anchor Darling Swing Check

Installation

INSTRUCTION MANUAL

Sizes 2-1/2” through 24”

FCD ADENIM0013-00

Operation

Maintenance

Swing Check Valves FCD ADENIM0013-00

REVISION RECORD

Revision Section Description Date

- All Original Issue 09/18/2003

TABLE OF CONTENTS

1.0

VALVE DESCRIPTION Page

1.1 Recommended Uses .................................................5

1.2 Principles of Operation .............................................. 5

1.3 Design Features ...................................................... 6

1.3.1 Bonnet Seals ............................................... 6

1.3.2 Disc Assembly and Seats............................7

1.3.3 Seat ...................................................... 8

2.0

CARE OF VALVE PRIOR TO INSTALLATION

2.1 Receiving Inspection..................................................8

Swing Check Valves FCD ADENIM0013-00

2.2 Handling .................................................................. 9

2.3 Storage .................................................................. 9

3.0

INSTALLATION INSTRUCTIONS

3.1 Rigging .....................................................................9

3.2 Cleaning ..................................................................... 9

3.3 Installing Valve In Line............................................... 9

4.0

VALVE MAINTENANCE

4.1 Inspection ....................................................... 10

4.2 Cleaning ....................................................... 10

4.3 Bolt Torquing ........................................................ 10

4.4 Refinish Sealing Surfaces........................................10

TABLE OF CONTENTS

5.0

DISASSEMBLY Page

5.1 Flanged Bonnet Valves.......................................................... 11

5.1.1 Bonnet .................................................................. 11

5.1.2 Disc Assembly......................................................... 13

5.1.2.1 Configuration A ......................................... 13

5.1.2.1.1 Pipe Plug Seal Cover .............. 14

5.1.2.1.2 Pressure Seal Cover ............... 15

5.1.2.1.3 Blind Cover Flange.................. 15

5.1.2.2 Configuration B ...................................... 16

5.1.2.3 Configuration C ...................................... 17

Swing Check Valves FCD ADENIM0013-00

5.1.2.4 Disc/Hinge Assembly ................................ 18

5.2 Pressure Seal Bonnet Valves ................................................ 19

5.2.1 Bonnet .................................................................. 19

5.2.2 Disc Assembly......................................................... 19

6.0

ASSEMBLY

6.1 Flanged Bonnet Valves.......................................................... 21

6.1.1 Disc Assembly......................................................... 21

6.1.1.1 Disc/Hinge Connection.............................. 21

6.1.1.2 Hinge Mounting ......................................... 22

6.1.1.2.1 Pin Mounted in Body Wall ......... 22

6.1.1.2.2 Bracket Pin on Bonnet .............. 24

6.1.1.2.3 Bracket Pin in Body................... 25

6.1.2 Bonnet ..................................................................... 26

6.2 Pressure Seal Bonnet Valves ................................................ 27

6.2.1 Disc Assembly......................................................... 27

6.2.2 Bonnet ..................................................................... 28

Swing Check Valves FCD ADENIM0013-00

1.0 VALVE DESCRIPTION

1.1 Recommended Uses

Anchor/Darling Swing Check Valves are designed to prevent the reversal of flow in a piping system. While they

may hold pressure in the reverse direction, they are not intended for use as isolation valves without special provisions e.g. elastomeric seats. A reliable seal across the disc can be expected if the reverse flow or differential pressure is large. However, when the differential pressure is low, difficulty may be encountered in obtaining a tight seal without special features being added to the valve. If the system operation requires sealing against a low pressure, Anchor/Darling should be consulted.

1.2 Principles of Operation (Fig. 1)

The principle parts of a swing check valve are the body, bonnet, disc and hinge assembly. The body and bonnet contain the fluid within the system. The disc is mounted on a hinge arm which rotates about a shaft positioned above the seat in the body neck. Flow in the normal direction creates a force on the disc which causes it and the hinge to rotate about the shaft. With increasing flow the disc assembly is rotated further from the seat up into the body neck. In the full open position a stop on the back of the hinge contacts the body. This positions the major portion of the assembly out of the flow stream and permits unobstructed fluid flow through the valve. Upon the cessation of forward flow or reversal of flow direction, the force holding the disc assembly open is no longer present, whereupon the weight of the assembly combined with the reverse flow causes the disc to return to the seat. Any seal obtained between the disc and the seat results solely from the difference in pressure across the disc. Hence, the difficulty in maintaining a tight seal at low pressures.

Figure 1

Swing Check Valves FCD ADENIM0013-00

1.0 VALVE DESCRIPTION

1.3 Design Features

1.3.1 Bonnet Seals

Anchor/Darling swing check valves are supplied with two basic types of body/bonnet closures; bolted bonnet or pressure seal. The bolted bonnet closure (Fig. 2) is a bolted flange tongue and groove joint with a gasket generally comprised of spiral-wound stainless steel and asbestos filler. The seal depends upon the bolt preload to maintain sufficient compressive force on the gasket.

Pressure seal type closures (Fig. 3) utilize a tapered soft metal ring gasket for sealing. The gasket is contained within the body neck bore by a retaining ring. The tapered inner surface of the gasket bears against a mating angular surface on the valve bonnet. Under internal pressure, the bonnet is forced against the pressure seal gasket, wedging it against the body neck wall. A slight interference angle produces a line contact and high sealing pressure. The greater the valve pressure, the tighter the metal-to-metal seal. No bolting is required to maintain the seal although the bonnet is initially drawn into contact with the pressure seal by cap screws.

(Continued)

Figure 2 Figure 3

Swing Check Valves FCD ADENIM0013-00

1.0 VALVE DESCRIPTION

1.3.2 Disc Assembly

The disc assembly (Fig. 4) consists of a flat faced disc tapering back to an integral disc pin. The threaded pin (and disc), loosely mounted in a hole in the bottom of the hinge arm, is held in place by a heavy nut that is drilled and pinned. The flexible disc-hinge connection permits the disc to completely contact the seat even if there is minor seat face movement. The hinge arm rotates about the hinge pin and has a stop on its tail below the disc pin hole. The stop contacts the body in the fully open position and prevents damaging impact forces from reaching the disc.

Three methods of supporting the hinge pin in the body have been used. Where shaft penetration of the body is acceptable (Fig. 5) or desirable, the pin is supported in journals that are integrally cast in the body neck above the seat ring. One journal is drilled through the body wall to permit insertion of the pin. In this design, the body penetration is sealed by a spiral wound gasket and a blind flange.

(Continued)

Figure 4

Figure 5

Swing Check Valves FCD ADENIM0013-00

1.0 VALVE DESCRIPTION

1.3.2 Disc Assembly (continued)

In an alternate arrangement (Fig. 6) the pin is supported in a bracket that mounts on two pads located above the seat ring. The pin and hinge fit down between the pads and are captured by them. In a third configuration (Fig. 7), the pin is supported in a bracket attached to the bonnet.

Figure 6 Figure 7

1.3.3 Seat

The seat ring is set into a machined recess in the body port which supports and retains the ring. A seal weld is provided between the body and the ring. This weld is for sealing only and is not structural. The seat ring is replaceable.

(Continued)

2.0 CARE OF VALVE PRIOR TO INSTALLATION

2.1 Receiving Inspection

Upon receipt of the valve, thoroughly inspect it for shipping damage. As a minimum, the following items should be checked:

1. Missing or loose bolting?

2. End covers in place?

3. Is valve securely fastened to shipping skid?

4. Abrasion - damaged paint?

5. Are spare parts shipped with valve and secure?

2.2 Handling

Anchor/Darling valves are shipped strapped to wooden skids designed to be moved by forklift. It is recommended that when being handled prior to installation, the valve be kept on its skids and a forklift truck be used for moving. If an overhead crane is used, care must be exercised to center the load. The slings should not lift the valve by the wooden skid structure alone, but must pass under the valve.

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