Design; Connections; Accessories - Flowserve Valtek Valdisk User Instructions

or repair operations, ensure that the valve and actuator are
depressurized and that the valve has been cleaned and is
free from harmful substances. Appropriate personal
protective equipment must be used, and service personnel
must be properly instructed in performing the repair
procedure.

6 Design

Body
The body may be lug style, wafer or integral (double) flange.
The design is compliant with ASME B16.34, ASME B16.5,
API 609 and MSS-SP-68. A lug style DIN body is compliant with
DIN EN 558 and EN 1092.
Disk/shaft/bearings
The disk is designed for maximum flow and minimum deflection
at maximum shutoff pressures. The shaft is two pieces on a few
sizes (3" [CL 150 / 300 / 600], 4" [CL 150 / 300], 6" & 8" [CL
150]) and single piece on other sizes. The shaft is affixed to the
disk with 2 or 4 tapered pins peened or welded in place. The
shaft has an anti-blowout ring to prevent accidental ejection of
the shaft under pressure, in the event of pin failure. A splined or
keyed shaft connection to the actuator provides precise control.
Metal or PTFE lined bearings are interchangeable within the
body.
Figure 2: Disk, Shaft & Pin
VAIOM000286-02 (EN/AQ) May 2023
Valtek Valdisk High-Performance Butterfly Control Valves
Shaft End Flange
A shaft end flange with a minimum of four bolts provides a
pressure tight seal through use of a high purity graphite or metal
seal.
Packing
The Valtek Valdisk packing boxes are designed to permit a wide
verity of packing configurations, including twin seal packing.
Packing configurations are,
Figure 3: Packing Configurations

6.1 Connections

Mechanical connections
6.1.1
The Valtek Valdisk, double offset butterfly valve is connected in
line through a:
1) lug style (threaded and clamped between two pipeline
flanges)
2) Wafer style (clamped between two pipeline flanges)
3) Integral flange style (double through hole flanges)
In some sizes, blind hole line bolt connections are used near
body/shaft necks.

6.2 Accessories

Electrical Connections
6.2.1
The valve may be with electrical accessories, such as solenoids
or positioners. Electro-pneumatic digital positioners require a 4-
20 mA connection. Solenoids and Electric valve actuators also
require an electrical connection. Follow appropriate IOM
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