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A flow module port fitting to be inserted in port hole in a flow module, which port hole is in communication with flow channel. The port fitting comprises a head, and a shaft with a center axis, attached to the head, wherein the shaft has a first and a second end portion, the port fitting comprises

A flow module port fitting to be inserted in port hole in a flow module, which port hole is in communication with flow channel. The port fitting comprises a head, and a shaft with a center axis, attached to the head, wherein the shaft has a first and a second end portion, the port fitting comprises further a fastening element at its first end portion for fastening the port fitting to the flow module or flow plate. The port fitting comprises further a seal arranged either externally on said shaft or seal is arranged at the second end portion facing away from the head, or seal is arranged in the short side of said second end portion, wherein seal is sealing port hole together with port fitting from the fluids flowing in flow channel.

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1. A port fitting for insertion in a port hole in a flow module or flow plate, the port fitting comprising: a head configured to extend outwardly from the port hole;a shaft having a central axis, the shaft extending from the head to a terminal end of the shaft and being configured to extend axially

1. A port fitting for insertion in a port hole in a flow module or flow plate, the port fitting comprising: a head configured to extend outwardly from the port hole;a shaft having a central axis, the shaft extending from the head to a terminal end of the shaft and being configured to extend axially into a flow channel in fluid communication with the port hole;the shaft defining a first portion and a second portion located radially inward from the first portion, the first portion defining a fastening element thereon for fastening the port fitting in the port hole, the first portion defining a first portion diameter extending axially inward from the fastening element and corresponding to a first port hole diameter, the second portion defining a second portion diameter extending axially inward from the first portion corresponding to a second port hole diameter, the second portion diameter being less than the first portion diameter thereby forming a first portion annular lip positioned against a corresponding port hole annular lip, the second portion terminating in a second end defining one of a tapered tip or an arcuate tip, the second end of the second end portion defining a free axial end of the shaft;an annular groove formed in the second end of the second portion, the groove facing axially away from the head and the groove defining an axial depth;an annular seal arranged in the groove radially inward from an exterior surface of the second end of the second portion, the seal having a cross sectional diameter that is of a greater magnitude than the axial depth of the groove, so that a portion of the seal protrudes from said groove and the terminal end extending axially inwardly into the port hole beyond the annular groove; andthe seal together with the port fitting being configured to seal the port hole from fluids flowing in the flow channel. 2. The port fitting according to claim 1, wherein the annular groove is arranged in one of: a tapered portion of the second portion proximate the tapered terminal end; and an arcuate portion of the second portion proximate the arcuate terminal end. 3. The port fitting according to claim 1, wherein the seal is a ferrule. 4. The port fitting according to claim 1, wherein said fastening element comprises one of: a threaded area on the first portion; andholes in the head for receiving a fastening element. 5. The port fitting according to claim 1, wherein said port fitting has a central bore extending an entire length of said port fitting aligned with said axis. 6. The port fitting according to claim 5, wherein the bore has one of: an inlet mounted thereto;an outlet mounted thereto;a nozzle mounted thereto;a sensor unit disposed therein;a thermocouple disposed therein;a spring loaded sensor disposed therein; anda resistance thermometer disposed therein. 7. The port fitting according claim 1, wherein said port fitting has a central bore aligned with said axis extending through the shaft and terminating a distance from the terminal end. 8. The port fitting according to claim 7, wherein one of a sensor unit, a thermo couple, a spring-loaded sensor and a resistance thermometer is mounted in said bore. 9. A port fitting for insertion in a port hole in a flow module or flow plate, the port fitting comprising: a head configured to extend outwardly from the port hole;a shaft having a central axis, the shaft extending from the head to a terminal end of the shaft and being configured to extend into the port hole;the shaft defining a first portion and a second portion located radially inward from the first portion, the first portion defining a first end proximate the head and a second end defining an axial end of the first portion and terminating at a first end of the second portion, the first portion defining a fastening element thereon for fastening the port fitting in the port hole, the first portion defining a first portion diameter extending axially inward from the fastening element and corresponding to a first port hole diameter, the second portion defining a second portion diameter extending axially inward from the first portion corresponding to a second port hole diameter, the second portion diameter being less than the first portion diameter thereby forming a first portion annular lip positioned against a corresponding port hole annular lip, the second portion terminating in a second end defining one of a tapered tip or an arcuate tip, the second end of the second end portion defining a free axial end of the shaft;an annular groove formed in the second end of the first portion, the groove facing axially away from the head and the groove defining an axial depth;an annular seal arranged in the groove radially inward from an exterior surface of the second end of the first portion, the seal having a cross sectional diameter that is of a greater magnitude than the axial depth of the groove, so that a portion of the seal protrudes from said groove and the second end of the first portion extending axially inwardly into the port hole beyond the annular groove; andthe seal together with the port fitting being configured to seal the port hole from fluids flowing in a flow channel. 10. A flow module for a reactor, the flow module comprising: a flow plate defining a front face and a periphery;one or more flow channels extending longitudinally within the flow plate;a plurality of port holes extending through the front face and into the flow plate substantially orthogonal to the one or more flow channels, each of the plurality of port holes being in fluid communication with at least one of the one or more flow channels; anda plurality of port fittings configured for insertion in a respective one of the plurality of port holes, each of the plurality of port fittings comprising: a head configured to extend outwardly from the port hole;a shaft having a central axis, the shaft extending from the head to a terminal end of the shaft and being configured to extend into the port hole;the shaft defining a first portion and a second portion located radially inward from the first portion, the first portion defining a first end proximate the head and a second end defining an axial end of the first portion and terminating at a first end of the second portion, the first portion defining a fastening element thereon for fastening the port fitting in the port hole, the first portion defining a first portion diameter extending axially inward from the fastening element and corresponding to a first port hole diameter, the second portion defining a second portion diameter extending axially inward from the first portion corresponding to a second port hole diameter, the second portion diameter being less than the first portion diameter thereby forming a first portion annular lip positioned against a corresponding port hole annular lip, the second portion terminating in a second end defining one of a tapered tip or an arcuate tip, the second end of the second end portion defining a free axial end of the shaft;an annular groove formed in one of the first portion second end and the second portion second end, the groove facing axially away from the head and the groove defining an axial depth;an annular seal arranged in the groove radially inward from an exterior surface of the second end of the second portion, the seal having a cross sectional diameter that is of a greater magnitude than the axial depth of the groove, so that a portion of the seal protrudes from said groove and the terminal end extending axially inwardly into the port hole beyond the annular groove;the seal together with the port fitting being configured to seal the port hole from fluids flowing in the at least one of the one or more flow channels; anda central bore extending an entire length of at least one port fitting aligned with the shaft central axis and in fluid communication with the at least one of the one or more flow channels, the bore having one of: an inlet mounted thereto, an outlet mounted thereto, a nozzle mounted thereto, a sensor unit disposed therein, a thermocouple disposed therein, a spring loaded sensor disposed therein, and a resistance thermometer disposed therein.