Cla-Val CRD-33 User Manual

3.94"

f

MODELS

CRD-33 and CRA-33

Electronic Actuated

Pressure Reducing Pilot Control

• Ideal for Pressure Management

• Simplified Remote Valve Set-Point Control

• Isolated Input

• 12-24VDC Input Power

• Reverse Polarity Protection

• IP-68 Submersible

The Cla-Val Model CRD-33 and CRA-33 Electronic Actuated Pressure
Reducing Pilot Controls provide remote set-point adjustment and accurate
downstream pressure control on Cla-Val 390 Series Control Valves.
Remote set-point command signals can be from any SCADA-type control
system using an analog 4-20 mA signal or by contact closure for cc/ccw
rotation.

The CRD-33 senses valve outlet pressure directly and the CRA-33 sens­es downstream pressure with remote hydraulic connection. Operating on
12 to 24 VDC and consuming very little power, they are an ideal control
system for remote valve sites that may even be solar powered. Existing
manually-set Cla-Val 90 Series Pressure Reducing control valves can be
retrofitted with CRD-33 or CRA-33 to add remote set-point control of deliv­ery pressure. Verification of downstream pressure may be sent to SCADA
system from customer supplied pressure sensor attached to valve outlet.

Flow

Higher Upstream

Pressure

Electronic Actuated

Pressure Reducing Valve

with CRD-33 Pilot Control

CLA-VAL

390 Series

6.50"

6.18"

CLA-VAL

CRD-33
Control

2.00"

Remote

Set-Point

Remote Telemetry Unit

(Customer Supplied)

Process Variable Transmitter o

Lower Downstream Pressure

Optional

(Customer Supplied)

SCADA

Computer

The CRD-33 and CRA-33 consists of a hydraulic pilot and integral con­troller that accepts a 4-20 mA remote set-point and positions the pilot to
maintain a pressure at valve outlet within preset limits. Pressure settings
are linear between these settings. Pressure settings are calibrated to the
specific spring range of the control. Special USB connector cable and free
downloadable software can be used to change this range if needed.
Continuous internal monitoring of actuator position results in smooth tran­sitions between pilot set-points with no backlash or dithering. Should
power or control input fail, the CRD-33 or CRA-33 pilot remains in auto­matic hydraulic control assuring system stability under all conditions.

Typical Applications

The CRD-33 and CRA-33 are installed on Cla-Val 390 Series valves
that maintain downstream pressure and require this pressure to be
changed from a remote location. It can be an effective solution for low­ering costs associated with "confined space" requirements by eliminat­ing the need for entry in valve structure for set-point adjustment. It is
also ideal for pressure management, and can be programmed to mini­mum night time and optimum daytime pressures. Optional profiler can be
used to create custom correlation between pressure and flow information.
Flow information can also be provided from the main valve, see E-133VF.
Additional pilot controls, hydraulic and/or electronic, are
also available to perform multiple functions to fit exact sys­tem requirements.

C

CRD-33 and CRA-33 Purchase Specifications

The Electronic Actuated Pressure Reducing Pilot Control shall have an integral hydraulic pilot and electronic controller contained in a
IP-68 rated submersible enclosure to provide interface between remote telemetry and valve set-point control. It will compare a remote
analog command signal with an internal position sensor signal and adjust the hydraulic pilot control spring mechanism to a new set-point
position. Remote analog signal input shall be isolated and reverse polarity protected. 4-20 mA actuator position feedback output shall be
supplied standard. A second command control input shall be from dry-contact switch closure for clockwise or counter clockwise actuator rota­tion. Assembly shall be factory calibrated to the spring range listed below.
If power fails, the control pilot valve shall continue to control main valve to last set-point command. If the Remote Set-Point signal is lost the actu­ator shall be programmable to go to either the 4mA, Last, or 20mA command set-point. No mechanical adjustments shall be necessary
to the actuator. The low and high position range adjustment shall be accomplished only with valve manufacturer's components and
instructions to be supplied in a separate kit. The assembly shall be supplied with 30 feet of cable.

The Electronic Actuated Pressure Reducing Pilot Control shall be Cla-Val Model CRD-33 or CRA-33 as manufactured by Cla-Val, Newport Beach, CA.

Pilot Control Subassembly Specifications

Adjustment Ranges

2 to 30 psi
15 to 75 psi
20 to 105 psi
30 to 300 psi

End Connection

3/8" NPT

Temperature Range

Water: to 180°F

Materials

Pilot Control: Bronze ASTM B62
Trim:Stainless Steel Type 303
Rubber:Buna-N

Available with optional Stainless Steel or Monel materials
at additional cost. Consult factory for details.
Note: Available with remote sensing control (specify CRA-33)

Note: Total Shipping Weight: 8 Lbs.

Options:

Re-ranging software - free download from www.cla-val.com.

•

Ranging software makes it easy to set low (4mA) and
high (20mA) set-point limits.

®

Synthetic Rubber

CRD-33 and CRA-33 Electronic Actuator Specifications

Supply Power Input: 1

Remote Command Inputs:

Position Feedback Signal: 4-20 mA

Alarm Output: Dry-contact closure (High/Low)

Speed of Rotation: Adjustable On/Off time, max 6 rpm
Diagnostic: LED Indicator
Loss of Power: Actuator will remain in last commanded

Loss of Signal Position: Programmable - 4 mA, Last, or 20 mA

Electrical Connections: Single, 30 feet of permanently attached

Mechanical Specifications:

Environmental

Protection Class: IP-68 (Temporary submersible)
Ambient Temperature: 15

24V DC24V DC

2V to
No Load draw: 50 mA
Max. Load draw: 250 mA

4-20mA, analog signal

•

(isolated and reverse-polarity
protected)

Dry contact closure (CW/CCW)

•

position.

cable with color-coded power supply
and signal wires

° to 150° F (-10° to 65° C)

USB connection cable required when changing range

•

parameters or restoring range parameters after servicing
pilot control subassembly.

LA-VAL

PO Box 1325 Newport Beach CA 92659-0325

E-CRD-33 and CRA-33 (R-9/2011)

Phone: [phone] Fax: [phone]

CLA-VAL CANADA CLA-VAL EUROPE

4687 Christie Drive
Beamsville, Ontario
Canada L0R 1B4
Phone: [phone]
Fax: [phone]

©COPYRIGHT CLA-VAL 2011 Printed in USA

Specifications subject to change without notice.

Materials

Enclosure and Bracket: Anodized Aluminum
Coupling Assembly: Stainless Steel
Gear Train: Stainless Steel, permanently lubricated

When Ordering, Please Specify

1. Catalog No. CRD-33 (Direct Sensing) or CRA-33 (Remote Sensing)

2. Materials - Pilot Control - Wetted Parts

Represented By:

Chemin dés Mesanges 1
CH-1032 Romanel/
Lausanne, Switzerland
Phone: [phone]
Fax: [phone]

www.cla-val.com