Kenco Engineering KDV DumpValve User Manual

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KENCO ENGINEERING COMPANY

P.O. BOX 470426 TULSA, OK 74147-0426

PHONE: [phone] FAX: [phone]

MODEL KDV SERIES “FREEZELESS” DUMP VALVE

The Kenco KDV series Dump Valve is a pneumatically controlled valve designed for fluid level control
in gas scrubbers, separators and other process pressure vessels. It is available with either 1” or 2”
process connections. The drain sizes available are ½”, ¾” and 1” depending on the model used. The
valve actuation pressure range is 30-70 psi depending on the model and process pressure (see figure 2).
Process pressure ratings of up to 2000 psi are available.

•Features:

•Ease of Maintenance-The union nut allows the
valve to be removed for service without removing
the Valve Body from the pressure vessel.

•Variety of Trim Sizes- Several trim sizes
available to accommodate different flow and
pressure requirements.

•High Performance Polyurethane Trim Seal-The
high performance polyurethane material used on the
Trim Seal is more durable and longer lasting than the
urethane used on competitive valves.

• Pressure Warning Port-If an attempt is made
to remove the valve assembly from the body
while the valve is under pressure, process fluid
and/or gas will leak from the weep hole to provide
a warning.

• “Keyed” Housing to Valve Joint-Valve is
keyed to diaphragm housing to ensure internal
retaining hardware does not twist or vibrate loose.

•Simple Installation-Valve is easily installed
with simple hand tools in a short amount of time.

Specifications:

Operating Temperature: -30 to 250°F

(-34 to 21°C)
Operating Process Pressure: Up to 2000 psi,
depending on model (See figure 1)
Valve Actuation Pressure: 30 to 70 psi
depending on process pressure (see figure 2)
Body Material: Nickel Plated 12L14 Carbon
Steel
Wetted Materials: Nickel Plated 12L14 Carbon
Steel, 303 Stainless Steel, Buna, Polyurethane.

FIGURE 2

56588 (Rev C)

Web: www.kenco-eng.com e-mail: [e-mail]

INSTALLATION AND OPERATING INSTRUCTIONS

70
60
50
40
30

(PSIG)

20
10

Actuation Pressure

0

0 500 1000 1500 2000

(NOTE: KDV-P05-2-1 HAS A CONSTANT ACTUATION PRESSURE OF 30 PSIG)

Actuation Pressure vs. Vessel Pressure

KD V-P15-2-1

Process Pressure (PSIG)

KD V-P18-1-X

KD V-P20-2-1

INSTALLATION OF KDV SERIES DUMP VALVE

1. Prior to valve installation, inspect the unit for damage from shipping. Inspect the inlet (process

connection) and drain to ensure no foreign material or debris is present.

2. Install valve using good piping practice. Use an appropriate pipe sealant on all NPT threads.

3. Make sure drain is facing down. Also make sure the vent plug is positioned at the bottom of the

valve before tightening the union nut. If necessary, the union nut can be loosened to orient the
diaphragm housing in the proper position. Be sure to tighten the union nut up firmly before
putting the valve into service or leaking may result.

4. Connect the 30 to 70 psi pneumatic input signal to the valve actuation port. Always use clean,

dry instrument quality air or gas.

5. To ease assembly and maintenance, plumb a union connection between the valve drain port and

the condensate/drain line of the pressure vessel. Kenco also recommends a manual 2-way shut
off valve installed in the process vessel at a level below the dump valve. The outlet on the
manual valve should be connected to the condensate/drain line.

TROUBLESHOOTING

Problem

Valve leaks when closed. 1. Debris between plug and

4. Crush washer excessively

5. Maintenance bolt is screwed

Valve will not open. Pressure drop across valve too

great.

Air/gas leaking from diaphragm
housing.

1. Diaphragm damaged. 1. Replace diaphragm.

Possible Cause Solution

1. Remove debris.

seat.

2. Plug and/or seat worn

3. Union nut not tight enough.

worn.

in too far, pushing the trim
plug off of the trim seat

2. Replace trim plug and seat.

3. Tighten union nut.

4. Replace crush washer.

5. Unscrew the maintenance

bolt until the trim plug is
fully seated against the trim
seat.

1. Increase pneumatic input

signal to 70 psi.

2. Make sure process pressure is

not higher than KDV-Dump
Valve rating.

WARNING!

Always make sure the process pressure is fully relieved, or zero before doing any

maintenance or assembly/disassembly to the valve!

MAINTENANCE AND REPAIR PROCEDURES

PREVENTATIVE MAINTENANCE

1. Inspect Trim Plug and Trim Seat for wear every 6 months.

2. Inspect Diaphragm, Thrust Plate and Trim Shaft for wear or damage once a year.