Flowserve Cast Flex Wedge Gate Valve User Manual

INSTRUCTION MANUAL

Anchor Darling Cast Flex Wedge Gate Valves

Sizes 2-1/2” through 24”

FCD ADENIM0010-02

Installation

Operation

Maintenance

Cast Flex Wedge Gate Valves FCD ADENIM0010-02

Revision Record

Revision Section Description Date

- All Original Issue 03/15/2006

01 1.3.1 correct gasket material 05/18/2011 02 5.4.4 180° was 1800 10/3/2011

Table of Contents

1.0 VALVE DESCRIPTION Page

1.1 Recommended Uses .................................................. 6

1.2 Principles of Operation ............................................... 6

1.3 Design Features ...................................................... 8

1.3.1 Bonnet Seals ............................................... 8

1.3.2 Disc Assembly and Seats ............................ 9

1.3.3 Actuation ...................................................... 9

2.0 CARE OF VALVE PRIOR TO INSTALLATION

2.1 Receiving Inspection ................................................ 10

Cast Flex Wedge Gate Valves FCD ADENIM0010-02

2.2 Handling ................................................................ 10

2.3 Storage ................................................................ 10

3.0 INSTALLATION INSTRUCTIONS

3.1 Rigging ................................................................... 10

3.2 Cleaning ................................................................... 11

3.3 Installing Valve In Line ............................................. 11

4.0 OPERATING THE VALVE

4.1 Hand Actuated ....................................................... 11

4.2 Motor Actuated ....................................................... 12

4.3 Operating Tips ........................................................ 12

5.0 VALVE MAINTENANCE

5.1 Inspection ................................................................. 13

5.2 Lubrication ............................................................... 13

5.3 Cleaning ................................................................... 14

5.4 Packing ................................................................... 14

5.5 Bolting Torque Values .............................................. 15

5.6 Refinishing Sealing Surfaces ................................... 17

Cast Flex Wedge Gate Valves FCD ADENIM0010-02

6.0 DISASSEMBLY Page

6.1 Actuators .................................................................. 19

6.1.1 Handwheel ................................................. 19

6.1.2 Gear ........................................................... 19

6.1.3 Motor and Air Cylinder ............................... 21

6.2 Flanged Bonnet Valves ............................................ 22

6.2.1 Yoke .................................................... 22

6.2.2 Bonnet .................................................... 22

6.2.3 Disc and Stem ........................................... 23

6.3 Pressure Seal Bonnet Valves ................................... 24

6.3.1 Yoke .................................................... 24

6.3.2 Bonnet .................................................... 25

6.3.3 Disc and Stem ........................................... 26

7.0 ASSEMBLY

7.1 Flanged Bonnet Valves ............................................ 27

7.1.1 Disc and Stem ........................................... 27

7.1.2 Bonnet ....................................................... 28

7.1.3 Yoke ........................................................... 28

7.2 Pressure Seal Bonnet Valves ................................... 29

7.2.1 Disc and Stem ........................................... 29

7.2.2 Bonnet ....................................................... 29

7.2.3 Yoke ........................................................... 29

7.3 Actuators .................................................................. 29

7.3.1 Manual ....................................................... 29

7.3.2 Motor and Air Cylinder ............................... 29

Cast Flex Wedge Gate Valves FCD ADENIM0010-02

1.0 VALVE DESCRIPTION

1.1 Recommended Uses Anchor/Darling Gate valves are designed to provide isolation of a piping system or a component when closed. They are not

suitable for modulation of flow, i.e. throttling, and should not be used for that purpose.

1.2 Principles of Operation The principle parts of a flex-wedge gate valve are the body, bonnet, disc, stem and top works (Fig. 1). The body and

bonnet contain the fluid within the system. The gate is positioned by the stem to either block flow through the body or is raised into the body neck to leave an unobstructed flow passage.

The disc to seat seal in the flex-wedge gate valve is created by a combination of internal pressure and mechanical wedging force. When the line pressure is high, the differential between the upstream and downstream ports forces the disc against the downstream seat and creates a seal. At lower line pressures (under approximately 100 psi), the pressure force alone is not sufficient to create a seal. A mechanical force resulting from the disc being wedged between the seat rings provides the additional force necessary to seal.

Cast Flex Wedge Gate Valves FCD ADENIM0010-02

1.0 VALVE DESCRIPTION (Continued)

Cast Flex Wedge Gate Valves FCD ADENIM0010-02

Figure 1

1.0 VALVE DESCRIPTION (Continued)

1.3 Design Features

1.3.1 BONNET SEALS Anchor/Darling flex-wedge valves are supplied with two basic types of body-bonnet closure: bolted bonnet or

pressure seal bonnet. The bolted bonnet closure (Fig. 2) is a bolted flange tongue and groove joint with spiral-wound stainless steel gasket and graphite 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 or graphite 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 annular 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.

Cast Flex Wedge Gate Valves FCD ADENIM0010-02

Figure 2 Figure 3

1.0 VALVE DESCRIPTION (Continued)

1.3 Design Features (Continued)

1.3.2 Disc And Seats The Anchor/Darling flexible wedge disc is a single cored casting consisting of symmetrical halves joined by a central

boss (Fig. 4). The design of the cored cavity permits uniform flexibility in the disc faces, enhancing sealing. Body seat rings are set into machined recesses in the body which support and retain the rings (Fig. 5). A seal weld is provided between the body and the rings. This weld is for sealing only and is not structural. The seat rings are replaceable.

1.3.3 Valve Actuation (Top Works) A gate valve is operated by moving the disc in and out of the seats with the stem. The necessary thrust for opening or

closing is imparted to the stem by the valve actuator which is supported and restrained by the yoke structure. Five types of actuators are normally supplied; handwheel, manual gear, electric motor, pneumatic cylinder, and hydraulic cylinder. The first three impart rotary motion to a stem nut which converts the rotary motion to linear stem movement via the acme stem threads. The pneumatic and hydraulic cylinder actuators provide direct linear motion to the stem. Sealing of the bonnet-stem penetration is accomplished by a bolted gland stuffing box containing ring type packing.

Cast Flex Wedge Gate Valves FCD ADENIM0010-02

Figure 4

Figure 5

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