Series 765 Reduced Port Valve

Series 765 Reduced Port Valve

The OCV 765 Control Valve is a globe pattern, reduced port engineered valve. The body,bonnet, internals and seat area are a size smaller than the flange size. Reduced port valves address the need for correctly sized valves without the use of pipeline reducers, allowing the valve to handle an application that demands flow rates of a smaller valve. An example would be an application where the flow rate dictates a 3″ valve is used but the line size is 4 inches; thus a Model 765, 4″ flanged body with 3″ internals appropriately fits this condition.
When equipped with a variety of pilots and accessories the 765 valve performs a wide range of automatic fluid control, making it a specified valve in many applications. Reduced port valves are not applicable for all applications; consult factory for proper sizing assistance. Most common applications are found in modulating or regulating valves; i.e. pressure reducing, pressure relief and among others.
Reduced port valves are available in most OCV valve series. Valve models using the reduced port basic valve start with a number 7. For example: Model 127-3 (full port pressure reducing) would become a Model 727-3 (reduced port pressure reducing).


  • Operates automatically off of line pressure
  • Heavy-duty, nylon-reinforced diaphragm
  • Rectangular-shaped, soft seat seal provides drip-tight Class VI closure
  • Diaphragm assemble guided top and bottom
  • Throttling seat retainer for flow and pressure stability
  • Easily maintained without removal from the line
  • Diaphragm replaced without removing internal stem assembly
  • Replaceable seat ring
  • Alignment pins assure proper reassembly after maintenance
  • Center-tapped bonnet facilitates installation of position indicator or valve-actuated switches
  • Ductile iron and steel valves are epoxy coated inside and outside for maximum corrosion protection
  • Factory tested
  • Serial numbered and registered to facilitate replacement parts and factory support
  • Use is dictated by flow rate instead of line size, which allows for the correct valve sizing without the use of pipeline reducers

Valve Operation

Valve Closed


When line pressure from the valve inlet is applied to the cover chamber, pressuring the diaphragm, the valve is closed drip-tight.

Valve Open


When diaphragm chamber pressure is vented the valve travels to the full open position.

Valve Modulating


The valve is between full open and closed. The valve’s control pilot modulates the pressure in the diaphragm chamber, positioning the valve to control the desired pressure or flow. OCV pilot systems provide accurate control in a wide range of performance requirements.





Material Specifications




For maximum efficiency, the OCV control valve should be mounted in a piping system so that the valve bonnet (cover) is in the top position. Other positions are acceptable but may not allow the valve to function to its fullest and safest potential. In particular, please consult the factory before installing 10″ and larger flanged valves, or any valves with a limit switch, in positions other than described. Space should be taken into consideration when mounting valves and their pilot systems.

A routine inspection & maintenance program should be established and conducted yearly by a qualified technician. Consult our factory @ 1-888-628-8258for parts and service.

How to order your valve

When Ordering please provide: Series Number – Valve Size – Class – Flanged Trim Material – Pilot Options – Special needs / or Installation Requirements. Refer to model sheet for specific options.