Frick Company

Frick York International

Milton W Garland

Joseph W Pillis

Zoltan A Mandy

Arthur James Marshall

F Michael Laucks

John Anthony Ecton, Jr

A digital input/output circuit board includes a plurality of circuits each having an input module and an output module for mounting either an input module or an output module, wiring terminals for attaching field wires to electrically connect the circuit board to field devices, a hot wiring terminal for attaching a hot power wire, and a neutral wiring terminal for attaching a neutral power wire. A computer connected to the circuit board receives input signals indicating the state of the field devices and sends output signals to activate other field devices.

Circuits provide input/output module connections having the input

A pressurized supply of oil for lubrication and other purposes for a helical screw compressor is automatically and continuously maintained in an oil separator in the compressor discharge line by a check valve assembly which is controlled by the pressure differential between the compressor inlet and the condenser, a bypass around the valve's control element permitting equalization of pressure on its opposite sides to permit closing by a biasing element.

Oil pressure maintenance for screw compressor

An ice builder coil has two or more coil sections, one above the other, supplied with refrigerant from a low pressure receiver, each coil section having an individual vapor return line to the low pressure receiver, the flow through the lower coil section being controlled by an ice thickness sensor associated with the lower coil section.

Ice builder and control system therefor

Fragmentary water ice is produced in an enclosure by metering water into a flowing body of liquid refrigerant having a greater density than the water or ice, lifting the ice out of the refrigerant and through a zone of further cooling in which the adhering liquid refrigerant, itself, is cooled and drained from the ice, and discharging the ice through an opening in the enclosure.

Method and apparatus for making fragmentary ice

The high pressure end wall of an axial flow helical screw type compressor has a slide member which is movable transversely of the rotors for controlling the size of the discharge passage through the end wall and is controlled by sensing means responsive to the pressure at the end wall and in the discharge area in order that full compression which is substantially equal to the pressure at discharge may be obtained.

Volume ratio control means for axial flow helical screw type compressor

A method of making ice in a tube shell ice-maker that has a false bottom compartment in which trapped refrigerant gas is present to prevent ice formation around the bottom during ice-making and from which hot gaseous refrigerant flows upwardly into the refrigerant within the tubes during defrosting, the liquid remaining within the tubes, whereby delay in initiating further ice-making is minimized.

Method of making ice using hot gas defrost

A shell and tube ice-maker has a bottom compartment in which trapped refrigerant gas is present to prevent entry of liquid refrigerant into the compartment during ice-making and from which, during defrosting, hot gaseous refrigerant flows upwardly into the liquid refrigerant which remains in flooded condition around the tubes, whereby delay in initiating further ice-making is minimized.

Shell and tube ice-maker with hot gas defrost

A tube shell ice-maker has a false bottom compartment in which trapped refrigerant gas is present to prevent ice formation around the bottom during ice-making and from which during defrosting hot gaseous refrigerant flows upwardly into the refrigerant within the tubes, the liquid remaining within the tubes, whereby delay in initiating further ice-making is minimized.

Ice-making apparatus with hot gas defrost

A vertical shell and tube icemaker wherein the refrigerant surrounds tubes within which ice is made, and the freezing refrigerant outlet is positioned below the defrost refrigerant outlet to expedite release of ice during defrosting, the system employing liquid refrigerant obtained by continuous flow from the receiver for defrosting. Water is supplied around the upper ends of the tubes for maintaining a vertical stream flow which is distributed around the inner circumference of each tube.

Icemaker liquid refrigerant defrost system

A two-stage refrigeration system has a gas-liquid intercooler which subcools liquid refrigerant passing from the feed tank to the evaporators. The feed tank is maintained at the desired pressure adequate for supplying the evaporators and receives return liquid from a separating system which is pressurized from the receiver. In a modification the system may be operated as a single stage or as a compound system.

Pressurized refrigerant feed with recirculation for compound compression

Liquid ammonia at a temperature of approximately -28.degree. F has its temperature raised to a level more suitable for transporting it, e.g. 40.degree. F, by passing it in heat exchange relation with higher temperature ammonia vapor which results from passing a liquid, such as water, from a waste heat source, in heat exchange relation with the ammonia, the vapor then condensing and the condensate returning to the heat exchange relation with the water, controls being provided to avoid inadvertent freezing of the water.

Closed circuit ammonia system for liquid heating from water

A refrigerant delivery and separation apparatus and a process for delivering refrigerant at evaporator temperature to an evaporator at a predetermined pressure which is less than the pressure at the receiver, and simultaneously separating refrigerant liquid and vapor which is discharged from the evaporator. The apparatus includes a pair of tanks connected by time operated control members to conventional refrigeration equipment so that one tank is pumping liquid refrigerant to an evaporator at a predetermined pressure while the other tank is separating liquid and vapor refrigerant substantially at evaporator pressure.

Dual liquid delivery and separation apparatus and process

Rotary apparatus for compressing and discharging fluid within a container. The apparatus includes an oscillating rotor or cam-like projection of substantially constant thickness in the plane of the longitudinal axis of the housing which cooperates with a sliding partition to define multiple compartments into which fluid is introduced during a portion of the rotation of the rotor or projection and is compressed during another portion of rotation of the rotor or projection.

Oscillating rotary compressor

A screw compressor apparatus in which the rotors have equal pitch circle diameters, and addendum and dedendum of equal radius.

Growing community of inventors

Waynesboro, PA, United States of America

Milton W Garland