Final Control Element Valve - Mark 37 and Mark 377

Mark 37 and Mark 377 Series Final Control Element Valve

Mark 37 and Mark 377 Series Final Control Element Valve - Side view

We aim to respond within 1 hour

Sliding gate seats to enable straight flow through to reduce turbulence and noise.
Fast operating speed due to a shorter stroke than globe or plug-style valves.
Stem packs four times deeper than the stem travel to supply long stem and packing life.

The Mark 37 Series control valve couples an electronic linear actuator with Jordans sliding gate seat technology to produce a highly accurate controller. This means that the Mark 37 is the ideal final control element for distributed process control systems.

Advantages of sliding gate seats

Sliding gate seats help to provide a greater level of accuracy than other controller designs as they have a shorter stroke due to the straight flow through of the system. Faster responses are also given by having a shorter stroke than globe or plug-style valves.

Seats are easily interchangeable and provide a tight shutoff that is ANSI Class IV rated. 306SST / Jorcote and 316SST / Jorcote are used as the seat materials while the body materials used are carbon steel, stainless steel, bronze and ductile iron.

Temperature ranges for the controller are between -20°C and 66°C with the option for a low temperature spec which can operate till -40°C. The enclosure is explosion proof for Class I, Div.1 Group C, D and is Dust-ignition-proof for Class II, Div. 1, Groups E, F, G.

Key specifications

Sizes	1/4" through 6" (DN8 through DN150). Note: 1/4" & 3/8" sizes uses 1/2" body with reducers.
End connections	Threaded (NPT, BSPT, BSPP – through 2" sizes) ANSI Flanges (150#, 300#) DIN Flanges (PN10/16, PN25/40)
Body materials	Bronze (1/2" - 2"/DN15-DN50) Ductile Iron Carbon Steel (WCB) Stainless Steel (CF8M)
Trim materials	303SS for DI, BZ or CS valves 316SS for SS body valves
Seat materials	303 SST/Jorcote 316 SST/Jorcote
Yoke material	Cast Iron
Stem Packing	Spring loaded Teflon (to 500°F/260°C); braided (above 500°F/260°C)
Service	steam, water, air, oil, gas and chemicals
Shutoff	ANSI Class IV
Flow characteristic	Linear Equal percentage (specify model MK377)
Action	Direct (control signal closes valve) Reverse (control signal opens valve)
Actuators	CML 100 Maximum Thrust 100 lb. (0,4 Kn) CML 250 Maximum Thrust 250 lb (1,1 Kn) CVL 500 Maximum Thrust 500 lb (2,2 Kn)