Fluid pressure sensing device

A device for measuring fluid pressure comprising:

• a body having an inlet passage, an outlet passage and a flow restriction connecting the inlet passage and the outlet passage;
• a housing;
• a chamber formed within the housing and having a curved wall section;
• a member disposed within the chamber and having a circular surface formed on a radius smaller than said curved wall section;
• whereby the member engages the curved wall section at different points depending upon the position of said member in said chamber;
• fluid pressure means for applying a force against said member proportional to the fluid pressure in the inlet;
• fluid pressure means for applying a second force against said member proportional to the fluid pressure in the restriction whereby the position of said member within the chamber is a function of the summation of the said first and second forces;
• and means for generating a signal representative of the point of contact between the member and the curved wall section of the chamber.

A fluid pressure responsive device comprising a housing;

• a chamber formed in said housing and having a curved wall section;
• a member disposed within said chamber and having a circular surface formed on a radius smller than that of said wall section whereby the circular surface of said member engages said curved wall section at different points depending upon the position of said member in said chamber;
• fluid pressure means exerting a force on said member such that the position of said member in said chamber is a function of the magnitude of the fluid pressure exerted by said last-mentioned means;
• and said fluid pressure means comprising a piston and means for urging one end of said piston against said member, said last-mentioned means comprising a flexible diaphragm having a first end abutting the other end of said piston and a second end in communication with the fluid pressure.

A fluid pressure responsive device comprising a housing;

• a chamber formed in said housing and having a curved wall section;
• a member disposed within said chamber and having a circular surface formed on a radius smaller than that of said wall section whereby the circular surface of said member engages said curved wall section at different points depending upon the position of said member in said chamber;
• fluid pressure means exerting a force on said member such that the position of said member in said chamber is a function of the magnitude of the fluid pressure exerted by said last-mentioned means;
• means for applying a predetermined constant force on said member so that the position of said member in said chamber is a function of the sum of the constant force and the force from the fluid pressure means, and said constant force means comprising a piston and resilient means for urging said piston against said member.