4057 / 4457 3-way valves

Features

● BALANCED FORCE DESIGN-PRESSURE CAN BE APPLIED TO ANY PORT

● CENTER DEAD SPOT-STD.

● PORT OVERLAP-OPTIONAL

● ARRANGED FOR PANEL OR BRACKET MOUNTING

● AVAILABLE IN ALUMINUM OR 316 STAINLESS STEEL

Applications

● HYDRAULIC FLUID CONTROL

● ACTUATOR CONTROL

● PNEUMATIC PANEL SYSTEMS

● SAFETY CONTROL SYSTEMS

Operation

AMOT Model 4057 or 4457 Valves were developed for use in manual and automatic hydraulic or pneumatic control systems. They offer versatility in operating requirements and allowable pressure limits. For a 1/4" size control valve, they offer exceptional flow capacity.

These valves are suitable for use on clean air, natural gas, L.P. gases, petroleum-base lubricants and hydraulic oils as well as many other fluids.

Each valve is carefully assembled, tested, and inspected to ensure that high quality standards are met. Valves are made from precision cast and machined aluminum or stainless steel parts. The unique porting arrangement eliminates seal ring cutting, and permits pressure inlet at any port without danger of seal "blow out". Standard construction permits valve pressures to 125 psi.

Certain of these valves are completely unique in the industry. For example, the 4057 or 4457 Type CP has a manual reset latch which automatically will drop out on introduction of pilot pressure, and permits return stroke on loss of pilot pressure.

These valves make use of AMOT's patented "Tad-Pole" seal which provides for lower friction and longer cycle life than conventional O-rings. (U.S. Pat. No. 3,926, 444).

AMOT Model 4057 and 4457 3-Way Valves feature modular construction and incorporate a sliding spool. The standard spool has a small center dead spot position and no valve port overlap. With the spool fully to the left (rest position) as shown in the diagrams, Port 2 is open to Port 3 and Port 1 is closed. With the spool moved to the right (actuated position), Port 2 is open to Port 1 and Port 3 is closed. The valves are available with a variety of manual and pressure operators and with manual, pressure or spring returns. See the Valve Type Description Table for the standard variations which are available.

Specifications

Body Material
4057; precision cast aluminum
4457; stainless steel

Standard Spool Material................. Glass reinforced Ryton
Standard Seal Material .............................................. Viton
Maximum Temperature ............................... 250°F (120°C)
Flow Coefficient (equivalent to 9/32 dia. port) C v =1.2

Maximum Pressure at Ports 1, 2 or 3 *125 psi (860 kPa)
Maximum Pressure at Ports A or B 150 psi (1034 kPa)
Maximum Pressure at Port C (Types CT & SB) **125 psi (860 kPa)

Net Weight ........
4057; 0.6 to 2.0 lbs (0.3 to 0.9 kg)
4457; 1.7 to 5.7 lbs (0.8 to 2.6 kg)

* 150 psi (1034 kPa) if a slight increase in operating force and pressure acceptable.
** 350 psi (2411 kPa) if a suitable orifice is used to prevent damage to valve components from sudden application of pressure.