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Apparatus to configure fluid regulators are described. In one example, a stem guide for use with a fluid regulator is described. The stem guide includes a body having an opening to slidably receive a valve stem and an outer surface having a plurality of circumferential seals that removably couple th

Apparatus to configure fluid regulators are described. In one example, a stem guide for use with a fluid regulator is described. The stem guide includes a body having an opening to slidably receive a valve stem and an outer surface having a plurality of circumferential seals that removably couple the body within a bore of a regulator casing and align the body with the regulator casing or a valve.

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1. A stem guide for use with a fluid regulator, comprising: a body having an opening to slidably receive a valve stem and an outer surface having a plurality of circumferential seals that removably couple the body within a bore of a regulator casing and align the body with the regulator casing or a

1. A stem guide for use with a fluid regulator, comprising: a body having an opening to slidably receive a valve stem and an outer surface having a plurality of circumferential seals that removably couple the body within a bore of a regulator casing and align the body with the regulator casing or a valve, the body having a passage extending through the body to fluidly couple an outlet of the valve to a chamber of the fluid regulator and an aperture to hold an insert member, wherein the insert member is to be removed from the aperture and coupled to the passage extending through the body to block fluid communication between the outlet and the chamber of the fluid regulator. 2. A stem guide as defined in claim 1, wherein the body or the regulator casing comprises a plurality of shoulders or grooves to retain the circumferential seals. 3. A stem guide as defined in claim 1, wherein the body is configured to facilitate use of a pressure-balanced valve mechanism. 4. A stem guide as defined in claim 1, wherein the circumferential seals are o-rings. 5. A stem guide as defined in claim 4, wherein the o-rings provide a seal between the outer surface of the body and an internal surface of the regulator casing. 6. A stem guide as defined in claim 4, wherein the o-rings apply a pre-load to the stem guide to reduce axial play between the stem guide and the regulator casing. 7. A fluid regulator, comprising: a first diaphragm assembly disposed within an actuator casing;a valve body coupled to the actuator casing;a stem guide removably coupled within the actuator casing and having a first passage to guide a valve stem operatively coupled to the first diaphragm assembly and a second passage extending through the stem guide to fluidly couple an outlet of the valve body to a diaphragm of the first diaphragm assembly, the stem guide having an opening to retain a removable insert to be removed from the opening and positioned at least partially in the second passage extending through the stem guide to configure the fluid regulator for external pressure registration; anda plurality of seals to align the stem guide with the actuator casing and the valve body, wherein a first seal from the plurality of seals is to be disposed between an outer surface of the stem guide and a first shoulder defined by an inner surface of the actuator casing, and a second seal from the plurality of seals is to be disposed between the outer surface of the stem guide and a second shoulder defined by an inner surface of the valve body. 8. A fluid regulator as defined in claim 7, wherein the each of the seals comprises an o-ring. 9. A fluid regulator as defined in claim 7, wherein the seals frictionally engage the actuator casing to retain the stem guide within the actuator casing. 10. A fluid regulator as defined in claim 7, wherein the removable insert comprises a screw and the second passage comprises threads, and wherein the screw is to be removed from the opening and threaded into the second passage. 11. A fluid regulator as defined in claim 7, wherein the first diaphragm assembly is interchangeable with a second diaphragm assembly to enable the regulator to have a first operational characteristic different from a second operational characteristic provided by the first diaphragm assembly. 12. A fluid regulator as defined in claim 11, wherein the second operational characteristic provided by the first diaphragm assembly enables the regulator to have a full internal relief and the second diaphragm assembly enables the regulator to have a token relief. 13. A modular regulator assembly, comprising: an actuator casing;a valve body coupled to the actuator casing;a first diaphragm assembly selected from a plurality of diaphragm assemblies and operatively coupled within the actuator casing, wherein the first diaphragm assembly is interchangeable with a second diaphragm assembly selected from the plurality of diaphragm assemblies, the first diaphragm assembly having a non-operative pressure relief valve assembly to prevent fluid flow between a first chamber and a second chamber of the actuator casing and across the first diaphragm assembly, and the second diaphragm assembly having an operative pressure relief valve assembly to allow fluid flow between the first and second chambers of the actuator casing and across the second diaphragm assembly;a first stem guide removably coupled within the actuator casing, wherein the first stem guide includes a bore to slidably receive a valve stem operatively coupled to the first diaphragm assembly, and wherein the first stem guide is selected from a plurality of stem guides and is interchangeable with a second stem guide selected from the plurality of stem guides, wherein the first stem guide enables a first trim to be coupled to the fluid regulator and the second stem guide enables a second trim to be coupled to the fluid regulator, wherein the first trim is different than the second trim, the first stem guide having a passage to fluidly couple an outlet of the valve body to the first diaphragm assembly and an opening to hold a screw, wherein the screw is to be removed from the opening and coupled to the passage extending through the body to block fluid communication between the passage and the first diaphragm assembly; anda plurality of seals between an outer surface of the first stem guide and an inner surface of the actuator casing to align the first stem guide with at least one of the actuator casing or the valve body. 14. A modular regulator assembly as defined in claim 13, wherein the plurality of diaphragm assemblies comprises a plurality of interchangeable relief valve seats, relief valve stems, pusher posts, diaphragms, diaphragm plates and levers. 15. A modular regulator assembly as defined in claim 14, wherein the second diaphragm assembly from the plurality of diaphragm assemblies provides a token internal pressure relief assembly of a full internal pressure relief assembly. 16. A modular regulator assembly as defined in claim 13, wherein the each of the seals is an o-ring. 17. A modular regulator assembly as defined in claim 13, wherein the seals frictionally engage the inner surface of the actuator casing to retain the first stem guide within the actuator casing. 18. A modular regulator assembly as defined in claim 13, wherein the first stem guide is to provide a pressure balanced trim style and the second stem guide is to provide a non-pressure balanced trim style. 19. A modular regulator platform as defined in claim 13, wherein the regulator is a direct acting regulator, a pressure loaded regulator, or a pilot operated regulator.