Liquid flow regulator
First Claim
Patent Images
1. A liquid flow regulator including:
- first and second chambers and a flow passage connecting said chambers;
a piston responsive to differential pressure between said chambers to move in a valve-closing direction in response to excess pressure in the first chamber over pressure in the second chamber;
a bias member urging said piston to move in said value-closing direction;
a varying rate resilient load opposing movement of said piston in said valve-closing direction;
a positionally adjustable datum member for said resilient load;
a motor coupled to move said positionally adjustable datum member;
an inlet passage coupled to said first chamber;
a regulating valve which is controlled by the piston and is disposed in said inlet passage upstream of the first chamber; and
a lever connection between said piston and said regulating valve.
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Accused Products
Abstract
A flow regulator particularly for sub-sea chemical injection at low continuous rates includes a piston moveable in response to differential pressure and controlling via a lever connection an inlet valve. The differential pressure is balanced by a dual rate spring assembly which is positionally adjustable by means of a screw-threaded adjusting rod.
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Citations
23 Claims
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1. A liquid flow regulator including:
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first and second chambers and a flow passage connecting said chambers;
a piston responsive to differential pressure between said chambers to move in a valve-closing direction in response to excess pressure in the first chamber over pressure in the second chamber;
a bias member urging said piston to move in said value-closing direction;
a varying rate resilient load opposing movement of said piston in said valve-closing direction;
a positionally adjustable datum member for said resilient load;
a motor coupled to move said positionally adjustable datum member;
an inlet passage coupled to said first chamber;
a regulating valve which is controlled by the piston and is disposed in said inlet passage upstream of the first chamber; and
a lever connection between said piston and said regulating valve. - View Dependent Claims (2, 4, 5, 6)
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3. A flow regulator including
first and second chambers and a flow passage connecting said chambers; -
a piston responsive to differential pressure between said chambers to move in a valve-closing direction in response to excess pressure in the first chamber over pressure in the second chamber;
a bias member urging said piston to move in said valve-closing direction;
a varying rate resilient load opposing movement of said piston in said valve-closing direction;
a positionally adjustable datum member for said resilient load;
a motor coupled to move said positionally adjustable datum member;
an inlet passage coupled to said first chamber; and
a regulating valve which is controlled by the piston and is disposed in said inlet passage upstream of the first chamber;
wherein said resilient load comprises a low rate spring in series with a high rate spring.
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7. A liquid-flow regulator comprising:
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(a) a body defining a first chamber and a second chamber, an inlet passage for the first chamber and an outlet passage for the second chamber;
(b) a regulating valve disposed in the inlet passage;
(c) a piston disposed between the first and second chambers so as to be moveable in response to differential pressure between the chambers;
(d) an orifice connecting the first and second chambers;
(e) a connection between the piston and the valve whereby movement of the piston in response to an increase in the differential pressure tends to close the valve;
(f) a multiple-rate resilient load structure which balances the differential pressure on said piston, the rate increasing as said piston moves in a valve-closing direction;
(g) a bias member disposed to urge said piston to move in said valve-closing direction; and
a lever coupled between the piston and the valve, whereby closure movement of the valve is in an opposite direction to said movement of the piston. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A regulator including:
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first and second chambers and a flow passage connecting said chambers;
a piston responsive to excess pressure in the first chamber over pressure in the second chamber to move in a valve-closing direction;
a resilient load opposing movement of said piston in said valve-closing direction;
an inlet passage coupled to said first chamber;
a regulating valve which is controlled by the piston and is disposed in said inlet passage upstream of the first chamber;
a lever coupled between the piston and the valve, whereby closure movement of the valve is in an opposite direction to said movement of the piston; and
a bias spring coupled to said piston to urge said piston in the direction for closing said valve. - View Dependent Claims (14, 15, 16)
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17. A liquid-flow regulator comprising:
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(a) a body defining a first chamber and a second chamber, an inlet passage for the first chamber and an outlet passage for the second chamber;
(b) a regulating valve disposed in the inlet passage;
(c) a piston disposed between the first and second chambers so as to be moveable in response to differential pressure between the chambers;
(d) an orifice connecting the first and second chambers;
(e) a connection between the piston and the valve whereby movement of said piston in response to an increase in the differential pressure tends to close the valve; and
(f) a positionally adjustable datum member;
(g) a compressive assembly, comprising a relatively high-rate spring in series with a relatively low rate spring, disposed between said datum member and said piston; and
(h) a motor coupled to move said positionally adjustable datum member. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification