Model GP - 3 way control valves

Features

● FAIL-SAFE, SPRING RETURN ACTUATOR

● ACCURATE AND REPEATABLE TEMPERATURE CONTROL

● LOW PRESSURE DROP

● SELECTABLE DIRECTION OF ROTATION

● VIBRATION RESISTANT

● MOUNT IN ANY POSITION

● COMPACT DESIGN

● NEMA 4 WEATHER PROOF CONSTRUCTION

● POSITION INDICATOR n SIZES 2" TO 16"

● 40 GPM TO 8300 GPM APPLICATIONS

Applications

For Refineries, Chemical Plants Reproduction:
~ Waste Heat Boilers
~ Product Coolers
~ Product Heaters
~ Product Condensers

For Engines, Turbines, Gear Boxes Exchanges:
~ Charge Air Cooling
~ Secondary Cooling Systems
~ Fuel & Lube Oil Preheating
~ Co-Generation
~ Engine Jacket Water

Operation

AMOT Model GP Valves are 3-way control valves consisting of a heavy duty rotary valve and a quarter turn pneumatic actuator. Model GP valves provide a high degree of accu-racy and repeatability for accurate temperature control. The valves are equally accurate in mixing or diverting service over a wide flow range. The heavy duty rotor design provides tight temperature control without high maintenance requirements.

Designed for high vibration service, the valves are qualified to Lloyd's Marine requirements for shipboard service. Valves can be directly mounted to reciprocating machinery such as diesel engines without vibration isolation. The heavy duty actuators are specially reinforced to provide vibration resistance.

The standard valves are suitable for a variety of fluids such as water, water/glycol, sea water, lubricating and hydraulic oils. Optional body and seal materials are available for services involving synthetic or fire resistant oils, deionized water and ammonia or freon in oil.

The compact design of the valves minimizes the installation space required. Combined with selectable direction of rotation and mode of operation, piping design can be simpli-fied providing low installation cost. The internal design provides unobstructed full flow keeping the pressure drop across the valve between 0.15 to 1.5 psig.

Used in conjunction with the proven AMOT Pneumatic or Electronic Controller, the complete system provides sim-plicity of operation and tight control of temperature.

The valve uses a spring return pneumatic actuator and positioner to control the rotation of the valve in response to an input signal from a pneumatic or electro-pneumatic control system. The pneumatic control system sends a pneumatic signal ranging from 3 to 15 psi to the actuator to correctly position the valve at the desired temperature setting. The pneumatic control system usually consists of a P+I pneumatic controller, sensor and the necessary air supply conditioning equipment (regulators, filters & water traps).

The electro-pneumatic control system uses a PID electronic controller, RTD sensor and transducer to correctly position the valve. The RTD sensor monitors the actual temperature and feeds the information to the PID controller. The PID controller sends a signal between 4 to 20mA through the transducer to the valve. The transducer, called an I/P ("I to P") converts the 4 to 20mA signal to the 3 to 15 psi that is needed to correctly position the pneumatic valve.

The all pneumatic system has the advantages of not requiring any electrical power. The all pneumatic system usually can be installed in hazardous and corrosive environments without the special requirements needed when using an electronic system.

The electro-pneumatic system has the advantages of having excellent read outs of actual temperature and set point. The set point can easily be changed on the controller. The electronic controller will also have more sophisticated features such as locking out or limiting set point changes.

AMOT can provide either the pneumatic or electro-pneumatic control system for the Model GP to meet the application requirements. The valve will also operate with many existing control systems. MODES OF OPERATION (Valves illustrated in "Cold" Position)

Specifications

Valve Body .......................... See Table C "Model Code System"
Rotor material:
__ All except Steel body ......................................... Bronze
Steel body .............................................. Stainless Steel
Rotor shaft material: .................................. Stainless Steel

Shaft seals material:
Standard ............................ Buna N
Optional ................................ Viton
Flanges: .................... See Table D "Model Code System"

Maximum working pressure:
Cast Iron/Bronze .... 145 psi
Steel ....................... 230 psi
Maximum temperature of fluid: ................... 212°F (100°C)
High temperature versions available to ... 300°F (149°C)
Pressure Drop Range: ...................................................... 0.15 psi (0.01 BAR) to 1.5 psi (0.1 BAR)

Actuator Material:

Housing............................................. Aluminum
Cover ........................................................ Steel Finish........................................................... Polyurethane
Enclosure ........................................................... NEMA 4 Supply
Pressure ........ 70 psi (5 BAR) to 100 psi (7 BAR) 145 psi (10 BAR)
Max. Control Signal................. 3-15 psi (Pneumatic Positioner)
4-20 mA (Electro-Pneumatic Positioner)

Standard rotor movement counterclockwise (when viewed from drive end) as temperature increases, clockwise is optional see "Mode of Operation".