RONALD G FRIEND
Engineering in Franklin, MA
License number
Massachusetts 27510
Issued Date
Jul 26, 1974
Expiration Date
Jun 30, 2002
Type
Mechanical Engineer
Address
Address
Franklin, MA 02038
Professional information
Pressure Responsive Pilot Valve
US Patent:
4384590, May 24, 1983
Filed:
Jun 3, 1981
Appl. No.:
6/269776
Inventors:
Ronald G. Friend - Franklin MA
Assignee:
Crosby Valve & Gage Company - Wrentham MA
International Classification:
F16K 1710
US Classification:
137102
Abstract:
A pressure responsive pilot valve for a pressure relief valve of the type held closed by system pressure applied to a dome over the valve member. The pilot valve has an inlet port exposed to system pressure, an exhaust port and a control port connected to the dome. Below a set system pressure, the pilot valve interconnects the inlet and control ports to pressurize the dome. At the set pressure, the pilot valve interconnects the control and exhaust ports. The set pressure is adjustable by a sleeve threaded in the body and the blowdown is adjustable by a stem extending through the sleeve.
Pressure Relief Valve Monitoring Device
US Patent:
2002002, Mar 14, 2002
Filed:
Sep 4, 2001
Appl. No.:
09/944223
Inventors:
Ronald Friend - Franklin MA, US
Michael Jones - Bristol RI, US
Michael Jones - Bristol RI, US
Assignee:
Anderson Greenwood, LP - Wrentham MA
International Classification:
F16K037/00
US Classification:
137/551000
Abstract:
A pressure relief valve monitoring device is provided. The monitoring device includes a sensor input module located proximate to a pressure relief valve, a microcontroller located within the sensor input module, and a real time clock/calendar also located within the sensor input module. The monitoring device also includes a number of sensors, including (1) a position sensor mounted on the pressure relief valve for measuring the position of the valve's closure element relative to the inlet nozzle seat and for generating a lift signal representative of such position; (2) a pressure sensor mounted on the pressure relief valve for measuring the pressure of the pressure system and generating a pressure signal representative of such pressure; and (3) a leakage sensor mounted on the pressure relief valve and positioned in close proximity to the inlet nozzle seat and capable of detecting noise generated by leakage of fluid between the inlet nozzle seat and the closure element when the closure element is engaged with the inlet nozzle seat. The microcontroller is configured to receive and store signals from any or all of the three sensors and correlate the receipt thereof with an indication of time from the real time clock/calendar to determine certain characteristics of valve performance. A method for monitoring the operation of the pressure relief valve is also provided.
Pressure Relief Valve Monitoring Device
US Patent:
6283138, Sep 4, 2001
Filed:
Apr 2, 1999
Appl. No.:
9/285268
Inventors:
Ronald George Friend - Franklin MA
Michael Allen Jones - Bristol RI
Michael Allen Jones - Bristol RI
Assignee:
Anderson, Greenwood LP - Wrentham MA
International Classification:
F16K 3700
US Classification:
137 14
Abstract:
A pressure relief valve monitoring device is provided. The monitoring device includes a sensor input module located proximate to a pressure relief valve, a microcontroller located within the sensor input module, and a real time clock/calendar also located within the sensor input module. The monitoring device also includes a number of sensors, including (1) a position sensor mounted on the pressure relief valve for measuring the position of the valve's closure element relative to the inlet nozzle seat and for generating a lift signal representative of such position; (2) a pressure sensor mounted on the pressure relief valve for measuring the pressure of the pressure system and generating a pressure signal representative of such pressure; and (3) a leakage sensor mounted on the pressure relief valve and positioned in close proximity to the inlet nozzle seat and capable of detecting noise generated by leakage of fluid between the inlet nozzle seat and the closure element when the closure element is engaged with the inlet nozzle seat. The microcontroller is configured to receive and store signals from any or all of the three sensors and correlate the receipt thereof with an indication of time from the real time clock/calendar to determine certain characteristics of valve performance. A method for monitoring the operation of the pressure relief valve is also provided.