Rostra Vernatherm, LLC

Rostra Precision Controls, Inc.

Kenneth Lionello

Kevin W Lamb

David Piscitelli

Alberto D Medina Santamaria

Tim Haskell

Michael J Nihan

Timothy Haskell

A wax filled actuator includes a piston in direct contact with the thermally responsive wax material. A cup containing the wax is mechanically secured to a guide that receives and controls axial movement of the piston in response to expansion and contraction of the wax. A seal between the cup and guide prevents leakage of the wax. Another seal surrounds the piston and prevents leakage of the wax around the piston. In a disclosed embodiment, the piston has a cylindrical, polished outside surface that aids in preventing adhesion of the wax to the piston. In a disclosed embodiment, the seal surrounding the piston is a radially compressed annular elastomeric member. The seal surrounding the piston may be disposed between flat, annular wipers. The seal and wipers may be axially retained between the guide and a washer trapped between the cup and guide.

Thermal actuator

A thermally actuated flow control valve mounted to a housing to control fluid flow based on temperature is provided. The control valve has a relief bias member in a cap projecting outside of the housing. Within the housing, the control valve has an actuator extending into a return bias container and a valve member. The actuator includes a thermally responsive material that expands and contracts in response to fluid flow over a predetermined range of temperatures. The actuator extends to close the valve member against a valve seat within the housing when the thermally responsive material expands. A return member moves the valve member away from the valve seat when the thermally responsive material contracts. The return bias container allows the relief bias member to accommodate pressures and temperatures beyond the predetermined range.

Control valve with external relief bias member

A thermally actuated flow control valve comprises a wax filled actuator assembly including a guide, a piston, a cup and a diaphragm. The cup is disposed at the guide first end and defines a cavity that receives a thermally activated pellet. The thermally activated pellet, diaphragm and piston act in concert to exert a variable actuating force as a temperature of a fluid increases between a first temperature Tand a second temperature T. The valve is arranged so that the cup and wax are directly exposed to fluid flowing through the valve and a peripheral shoulder of the cup acts as a valve member to control flow through the valve. One end of the guide also acts as a valve member to control flow between an inlet and outlet of a return flow pathway.

Four way valve with oil filled actuator

A self-contained thermal mixing valve includes a cap defining a bore, a relief spring and abutment plate within the bore, and a temperature responsive actuator arranged to generate an actuation force against said abutment plate when exposed to a predetermined increase in temperature. A slide is secured to the actuator and moves with the actuator in response to temperature changes. The slide defines a mixing chamber surrounding the temperature sensitive part of the actuator and includes a fluid flow slot axially aligned with the temperature sensitive part of the actuator. The slide is configured to move along a bore which includes axially offset fluid flow inlets, causing the fluid flow slot to vary fluid flow from the fluid flow inlets into the mixing chamber to produce a mixed outflow within a predetermined temperature range. The relief spring provides mechanical relief to the actuator in over-temperature situations.

Self-contained thermal mixing valve

A self-contained thermally actuated flow-control valve assembly comprises a base, an actuator, and a return member. The base has a longitudinal axis, a stop surface and a retention wall. The actuator has a generally cylindrical guide, a piston, a diaphragm, a thermally active pellet, and a generally cylindrical cup. The guide has an exterior surface on which a plurality of retention members are configured. The piston assembly is coaxial with the longitudinal axis. The generally cylindrical cup has a leading wall, a sidewall contiguous with the leading wall, and a trailing shoulder axially opposite the leading wall. The return member has axially opposed first and second ends. The first end engages the retention members and the second end engaging the base. The return member exerts a biasing force on the actuator axially towards said base. The actuator exerts a variable actuating force in a direction axially opposite the biasing force.

Self-contained thermally actuated flow-control assembly

A thermally actuated power element comprising an actuator having a guide, defining a generally cylindrical bore extending between first and second guide ends. The guide first end has a generally convex valve member projecting radially between the bore and a valve member periphery, defining a plurality of substantially identical flow depressions. The flow depressions are configured radially intermediate the cylindrical bore and the periphery, while an annular valve member seal surface extends between a radial boundary of the flow depressions and the periphery. A piston having axially opposed first and second piston ends is partially received in the generally cylindrical cavity. A generally concave cup defines a cavity and contains a thermally active pellet, and a diaphragm is received in the guide second end intermediate the cup and said piston. A generally cylindrical return member engages the guide adjacent the periphery.

Thermally actuated power element with integral valve member

A fluid control thermostatic valve contains thermally responsive wax. As temperature rises, the wax expands thus pushing a deformable member up a confined path defined by guideuntil the member contacts a fixed post. An immobile retaineris secured to the fixed post. Force from the elastic member against the post causes actuatorto separate from retainer, thus opening a flow passage. The control valve is unique because retainerfunctions as both a valve seat for actuatorand a fixed support for spring

Thermostatic bypass valve with a unique valve seat

A thermally actuated valve employs a plunger and bore valve configuration. A thermally expansible wax actuator has an axial length that changes in response to the temperature in a cavity of the valve. At temperatures above a predetermined set point, the actuator produces axial force sufficient to extend the length of the actuator against a return bias and project the plunger and seal into the bore, closing the valve. The plunger defines a pressure relief fluid flow path from the valve cavity to the valve outlet. A pressure relief valve is arranged in the plunger and is responsive to pressure in the valve. The pressure relief valve opens to relieve pressure above a pre-determined level. The thermally actuated valve and the pressure relief valve are coaxial and employ a common outlet.

Integrated freeze protection and pressure relief valve

An improved heat exchanger, and flow control valve assembly associated with a heat exchanger, of the type wherein the temperature responsive flow control valve is integrated with the heat exchanger the valve assembly is well suited for mounting at the discharge port of the heat exchanger, without relying on rigid interaction with the inside wall of the discharge header or the tube ends in the discharge header. In this manner, the same basic valve assembly can be utilized in a variety of heat exchanger headers, merely by adapting the connection between the end of the valve assembly closest to the discharge port, and the housing or related structure of the heat exchanger at the discharge port. To the extent a relatively standard size valve assembly is to be used with heat exchangers having discharge conduits of different cross sectional area or shape, a baffle member can be placed around the valve assembly before insertion into the header.

Thermally actuated valve assembly

A specially profiled wax retaining cup and piston guide are crimped together to compress a peripheral portion of a diaphragm wax seal to the extent of extruding the diaphragm material to form both an axial seal and at least one radial seal. The compressed, extruded diaphragm seal provides a wax containment seal capable of withstanding high wax pressures that generate high actuation forces. A wax filled thermal actuator reliably produces an actuating force F sufficient to lift a load in a range of 2500 to 6000 times the mass of the actuator. Performance of the thermal actuator may also be expressed in terms of the internal pressures generated and delivered to the bottom of the actuator piston. The pressure applied to the bottom of the actuator piston in the inventive actuator is in the range of approximately 1700 to 8800 psi (124 to 620 kg/cm).

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Waterbury, CT, United States of America

Kenneth Lionello