M series gate valves
M series gate valves
The Valveworks USA M series consists of a lineup of gate valves with reliable, proven designs that are engineered and manufactured to meet the requirements of API 6A. This series of gate valves offers the user several options depending on the specific application including achieving a positive seal at wellbore/flowline pressures ranging from zero to 5,000 PSI.
M series gate valves are full-bore, through-conduit valves. This allows for downhole tools to be passed through the wellhead and reduces turbulent flow. M series valves are similar to each other in design with only slight variations across the lineup, offering a high percentage of parts interchangeability, giving you an efficiency-driven advantage in the management and maintenance of your gate valve fleet and providing optimal lifecycle management integrity.
Below is an in-depth look at the details of this series of gate valves and explains the features, benefits, characteristics, dimensional & technical data and other valuable information needed to determine which valve suits your specific application.
ENGINEERING NOTES
Expanding Gate Assembly Operation Explained – The expanding gate assembly consists of two main components: the gate (major) and the segment (minor). These components are assembled together using precision machined pins and high-quality precision formed and treated Nickel-Chromium alloy springs. When the valve is manually operated, the gate and segment act one against the other by means of a dual expanding wedge when the valve is either fully-opened or fully-closed. This expansion effect of the gate assembly against the valve seats through parallel faces of the gate assembly provides a strong and positive seal against pulsations and vibrations created by flow conditions.
Model MDS & Model MRC DS – These models are unidirectional gate valves equipped with an expanding gate assembly and a sealing seat in the downstream seat pocket. The upstream seat pocket is equipped with a non-sealing seat assembly. This allows pressure to bypass the upstream seat, equalize throughout the valve body, and only seal against the downstream seat assembly as the original Model M was intended. All model MDS valves are marked with a flow direction arrow for accurate installation.
NOTE: When bidirectional operation is required, a slab gate valve is necessary. M Series expanding gate valves (Model MDS and Model MRC DS) are not designed for bidirectional operation.
Pressure Testing – M series gate valves are not intended to be tested through the body lubrication fittings. These fittings are designed for lubrication purposes only. Shell tests and gate/seat tests shall be conducted from the end/outlet connection by qualified personnel.
