Hammer union back pressure regulator
A hammer union back pressure regulator is provided. The hammer union back pressure regulator comprises a regulator body, a bonnet, a housing and a flow control member. The regulator body defines a flow inlet, a flow outlet, and a flow passage in fluid communication with the flow inlet and the flow outlet. The bonnet is coupled to the regulator body with a hammer union nut. The flow control member is configured to adjust the pressure at which the hammer union back pressure regulator will allow flow through the flow passage.
1. A back pressure regulator, comprising:
a regulator body defining a flow inlet, a flow outlet, and a flow passage communicating the flow inlet with the flow outlet;
a bonnet coupled to the regulator body with a hammer union nut;
a flow restrictor assembly configured to prevent flow from the flow inlet to the flow outlet until a predetermined pressure is reached at the flow inlet;
a flow control member configured to adjust the predetermined pressure, the flow control member and an inner surface of the bonnet defining an annular space therebetween; and
a lip seal filling the annular space.
2. The back pressure regulator of claim 1 , wherein the regulator body is a tee union.
3. The back pressure regulator of claim 1 , further comprising:
a ball cage disposed in the bonnet; and
a ball positioned in the ball cage, wherein the ball blocks flow through the flow inlet until the predetermined pressure is reached.
4. The back pressure regulator of claim 3 , wherein the flow restrictor assembly comprises:
a sleeve disposed in the regulator body and defining a part of the flow passage, the sleeve defining a valve seat thereon;
the ball being engageable with the valve seat; and
a spring configured to urge the ball against the valve seat to prevent flow to the flow outlet until the predetermined pressure is reached.
5. The back pressure regulator of claim 4 , wherein the flow control member is configured to adjust a compression of the spring to set the predetermined pressure.
6. The back pressure regulator of claim 4 , the sleeve and spring being disposed in the ball cage.
7. The back pressure regulator of claim 1 , wherein the hammer union nut is threaded to the regulator body, and wherein the hammer union nut defines a weep hole configured to release excess pressure from the flow passage upon unthreading the hammer union nut.
8. A back pressure regulator comprising:
a regulator body defining a flow inlet, a flow outlet and a flow passage communicating the flow inlet with the flow outlet;
a bonnet having an end surface engageable with an end surface of the regulator body;
a hammer union nut disposed about the bonnet and threadedly connected to the regulator body; and
a flow plug positioned in the flow passage configured to prevent flow from the inlet through the flow passage to the outlet until a predetermined pressure is reached at the flow inlet, an end surface of the regulator body defining a groove therein, wherein an O-ring is positioned in the groove and the end surface of the bonnet engages the O-ring when the hammer union nut is threaded to the regulator body; and
wherein a ridge on the end surface of the bonnet is received in the groove and engages the O-ring seal when the hammer union nut is threaded to the regulator body.
9. The back pressure regulator of claim 8 further comprising a flow control member configured to adjust the predetermined pressure.
10. The back pressure regulator of claim 8 , further comprising:
a valve seat, the flow plug being engageable with the valve seat; and
a biasing means for urging the flow plug into the valve seat to the block flow through the flow path.
11. A back pressure regulator comprising:
a regulator body defining a flow inlet, a flow outlet and a flow passage communicating the flow inlet with the flow outlet;
a bonnet having an end surface engageable with an end surface of the regulator body;
a hammer union nut disposed about the bonnet and threadedly connected to the regulator body;
a flow plug positioned in the flow passage configured to prevent flow above a predetermined pressure from the inlet through the flow passage to the outlet;
a valve seat, the flow plug being engageable with the valve seat; and
a biasing means for urging the flow plug into the valve seat to block flow through the flow path; and
the end surface of the regulator body defining a groove therein, wherein an O-ring is positioned in the groove and the end surface of the bonnet engages the O-ring when the hammer union nut is threaded to the regulator body.
12. The back pressure regulator of claim 11 further comprising a flow control member configured to adjust the predetermined pressure.
13. The back pressure regulator of claim 11 , wherein a ridge on the end surface of the bonnet is received in the groove and engages the O-ring seal when the hammer union nut is threaded to the regulator body.