GATE VALVES

MFC offers gate valves that can be either:

Rising Stem 

Rising stems provide a visual indication of valve position because the stem is attached to the gate such that the gate and stem rise and lower together as the valve is operated.

Non-Rising Stem 

Non-rising stem valves may have a pointer threaded onto the upper end of the stem to indicate valve position, since the gate travels up or down the stem on the threads without raising or lowering the stem.  Non-rising stems are used underground or where vertical space is limited

 Bonnets provide leak proof closure for the valve body.  MFC offers gate valves that may have:

Screw-in 

Simplest, offering a durable, pressure-tight seal

Union 

Suitable for applications requiring frequent inspection and cleaning.  Also gives the body added strength

Bolted Bonnet 

Used for larger valves and higher pressure applications

Pressure Seal Bonnet 

This construction is adopted for valves for high pressure service.  A unique benefit of a pressure seal bonnet design is that the seal improves as the internal pressure in the valve increases.  Compared to other constructions where the increase in internal pressure tends to create leaks in the body-bonnet joint.

MFC offers gate valves that may have flanged ends which are drilled according to pipeline compatible flange dimensional standards.