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An actuator for operating a valve comprises a housing, a cap, a ring and a piston. The housing has a connecting interface for being mounted on the valve. The cap substantially covers a first portion of the housing. Both the cap and the housing define a substantially enclosed space inside the housing

An actuator for operating a valve comprises a housing, a cap, a ring and a piston. The housing has a connecting interface for being mounted on the valve. The cap substantially covers a first portion of the housing. Both the cap and the housing define a substantially enclosed space inside the housing. The ring sealably covers a second portion of the housing. The ring is equipped with two ports that are in fluid communication with the enclosed space. The piston is slidably located inside the housing. Advantageously, an actuator assembly may include the actuator as previously described and one bonnet, one of the connecting interfaces of the actuator being connected to the bonnet. The bonnet is adapted to be mounted to a valve body.

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1. An actuator assembly for operating a valve through a stem, the actuator comprising: a housing having a connecting interface for being mounted on the valve;a cap for substantially covering a first portion of said housing, said cap and said housing defining a substantially enclosed space inside sai

1. An actuator assembly for operating a valve through a stem, the actuator comprising: a housing having a connecting interface for being mounted on the valve;a cap for substantially covering a first portion of said housing, said cap and said housing defining a substantially enclosed space inside said housing;a piston slidably located inside said housing and operative to contact the stem;a ring sealably covering a second portion of said housing, said ring being equipped with two ports, each of said two ports being in fluid communication with said enclosed space on a different side of said piston, and said ring being mountable on said housing such that said ports may be positioned in a variety of orientations; anda valve bonnet mountable to either one of said connecting interfaces, said bonnet being adapted to be mounted to a valve body of the valve. 2. The actuator assembly of claim 1 wherein said cap also comprises a connecting interface for being mounted on the bonnet, both said connecting interfaces having a substantially similar configuration. 3. The actuator assembly of claim 2 wherein said actuator is rotatably mounted to said bonnet. 4. The actuator assembly of claim 3 wherein said connecting interfaces and said bonnet have matching threads. 5. The actuator assembly claim 4 wherein both connecting interfaces comprise a locking mechanism for locking said actuator in place on said bonnet. 6. The actuator assembly of claim 5 wherein said locking mechanism is a set screw. 7. The actuator assembly of claim 6 wherein said ring and said housing define two separate circumferential passageways, a first of said passageways being in fluid communication with a first of said two ports and a second of said passageways being in fluid communication with a second of said two ports. 8. The actuator assembly of claim 2 wherein the stem is connected to said piston, said stem being operatively located to protrude within said connecting interface of one of said housing and said cap to operate the valve. 9. The actuator assembly of claim 2 further comprising a spring to bias said piston in one direction. 10. The actuator assembly of claim 2 further comprising a sight window mounted to the other of said connecting interfaces. 11. The actuator assembly of claim 2, wherein said valve bonnet is extendably mounted to said either one of said connecting surfaces so as to accommodate a change in the length of stroke of said piston. 12. The actuator assembly of claim 11, wherein said connecting interfaces and said valve bonnet have matching threads. 13. The actuator assembly of claim 7, wherein the housing defines one or more first orifices within the section of the housing defining the first of said circumferential passageways and defines one or more second orifices within the section of the housing defining the second of said passageways, the first of said two ports being in fluid communication with said enclosed space through the first of said circumferential passageways and through one or more of said first orifices and the second of said two ports being in fluid communication with said enclosed space through the second of said circumferential passageways and through one or more of said second orifices. 14. The actuator of claim 13, wherein the housing comprises: a first circumferential groove defining the one or more first orifices and the first of said circumferential passageways with the ring; anda second circumferential groove defining the one or more second orifices and the second of said circumferential passageways with the ring. 15. The actuator of claim 7, wherein the ring comprises a first circumferential groove defining the first of said passageways with the housing, and a second circumferential groove defining the second of said passageways with the housing. 16. An actuator assembly for operating a valve through a stem, the actuator comprising: a housing having a first connecting interface;a cap for substantially covering a first portion of said housing, said cap and said housing defining a substantially enclosed space inside said housing, and said cap having a second connecting interface with a substantially similar configuration as said first connecting interface;a piston slidably located inside said housing and operative to contact the stem;a valve bonnet extendably mounted to either one of said connecting interfaces, the length of stroke of said piston being adjustable when the valve bonnet is extendably mounted, said bonnet being adapted to be mounted to the body of the valve; and a sight window mounted to the other of said connecting interfaces;wherein the housing further defines one or more of first orifices arranged circumferentially and one or more second orifices arranged circumferentially, the first orifices providing a fluid communication between the enclosed space on a first side of the piston and an outside of the housing and the second orifices providing a fluid communication between the enclosed space on a second side of the piston and the outside of the housing; andwherein the housing further comprises a first circumferential groove defining a first circumferential passageway, and a second circumferential groove defining a second circumferential passageway. 17. An actuator for operating a valve through a stem, the actuator comprising: a housing having a connecting interface for being mounted on the valve;a cap for substantially covering a first portion of said housing, said cap and said housing defining a substantially enclosed space inside said housing;a piston slidably located inside said housing and operative to contact the stem;a ring sealably covering a second portion of said housing, said ring being equipped with two ports, each of said two ports being in fluid communication with said enclosed space on a different side of said piston, and said ring being rotatable on said housing such that said ports may be positioned in a variety of orientations;wherein the ring and the housing define two separate circumferential passageways, a first of said two ports being in fluid communication with said enclosed space through a first of said passageways and a second of said two ports being in fluid communication with said enclosed space through a second of said passageways;wherein said cap also comprises a connecting interface for being mounted on the valve, both said connecting interfaces having a substantially similar configuration; andwherein either one of said connecting interfaces is mountable to a valve bonnet adapted to be mounted to a body of the valve.