Flowserve Valtek Mark One Three-way Control Valve User Manual

Valtek three-way control valves

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Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611

Valtek Three-way
Control Valves

Valtek No. 49013

GENERAL INFORMATION

The following instructions are designed to assist in
unpacking, disassembling, reassembling and trou-
bleshooting Valtek

®

three-way control valves. Product

users and maintenance personnel should thoroughly
review this bulletin in conjunction with Installation, Op-
eration, Maintenance Instructions 1 (Mark One and Two
Control Valves) prior to installing, operating or perform-
ing any maintenance on the valve.

This publication does not contain information on Valtek
positioners. Refer to the appropriate Installation, Op-
eration, Maintenance Instructions for installing, main-
taining, troubleshooting, calibrating, and operating
Valtek positioners.

To avoid possible injury to personnel or dam-
age to valve parts, WARNING and CAUTION
notes must be strictly adhered to. Modifying
this product, substituting nonfactory parts, or
using maintenance procedures other than out-
lined could drastically affect performance and
be hazardous to personnel and equipment, and
may void existing warranties.

Three-way valves are used for either converging or
diverging service. For interchangeability, a standard
globe valve converts to a three-way valve with the
addition of a three-way adaptor, upper seat ring, two
upper seat gaskets, and a three-way plug. Its operation
is similar to a standard Mark One globe valve.

Unpacking

1. While unpacking the valve, check packing list against

the materials received. Lists describing valve and
accessories are included in each shipping container.

2. When lifting the valve from the shipping container,

position the lifting straps to avoid damage to the
tubing and mounted accessories. Valves provided
with a lifting ring (up to 6-inch) may be lifted by the
actuator lifting ring. On larger valves, lift the valve
using straps through the yoke legs or if provided,
lifting brackets bolted to bonnet stud.

3. In the event of shipping damage, contact your ship-

per immediately.

4. If any problems arise, contact your Flowserve

representative.

Troubleshooting

If difficulty is suspected with the control valve, check the
following:

1. Make sure the valve has a sufficient air supply.

2. Check for air leaks in the air supply, instrument signal

system, and positioner.

3. Make sure the packing isn’t too tight by lossening the

gland flange nuts and retightening to just over finger-
tight.

CAUTION: Do not overtighten the packing. This
can cause excessive packing wear and high stem
friction which may impede plug movement.

Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611

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