Comparing Poppet Valves vs. Spool Valves

Rachel Desenberg — Tue, 18 Dec 2018 17:53:28 +0000

Category:

Two of the most common designs for pneumatic control valves are the poppet and the spool. A poppet valve consists of an orifice that is opened and closed by raising and lowering a sealing surface onto the orifice. It usually has an internal spring that holds the valve in the closed position. When the spring force is overcome, the sealing surface lifts off the orifice and the valve opens. A spool valve consists of a shaft with a series of O-rings inside of a barrel. As the shaft moves back and forth, the O-rings shift position to open and close different flow paths.

What Are the Benefits of Poppet Valves?

A poppet is a valving element that seals on a valve seat. A return spring and the inlet pressure assist in sealing the valve. Compared to spool valves, poppet valves provide certain advantages and disadvantages which make them better suited for particular applications such as those that require precise control, high flow rates, long life, low leak rates, fast response times, or low cost.

What Are the Benefits of Spool Valves?

A spool is a cylindrical valve element that opens and closes ports when moved axially within the valve bore. Most spool valves use elastomers to seal between flow paths. Compared to poppet valves, spool valves provide certain advantages and disadvantages which make them better suited for vacuum applications, applications which require holding pressure downstream, selector valve applications, and applications which require consistent response time.

Poppet or Spool—Which Will Work Best for Your Application?

To choose which type of valve—poppet or spool— will best meet your specific needs, consider the factors that are most critical for your application. For example, poppet valves are better suited for applications which require precise control due to the closed crossover (no transitional state from one function to the next). They are also a better choice for applications which require fast response times because they open immediately upon actuation and feature a shorter stroke. However, if your application requires consistent response time or utilizes a vacuum, you should choose a spool valve instead. The chart below serves as a good starting point. Still have questions? Contact �ǳ�web or your local �ǳ�web distributor for assistance.

Tags:

Spool

Poppet

MTV

�ǳ�web MTV/MJTV Series Pneumatic Toggle Valves

Rachel Desenberg — Fri, 20 Nov 2015 14:07:40 +0000

Category:

Product Information

These #10-32 and 1/8" NPT ported 2-way, 3-way and 4-way valves are manually actuated with a toggle. The toggles are electroless nickel plated steel and have a detent action. The MTV-5 has threaded exhaust and can be connected in a dual inlet pressure configuration. For high temperature applications (up to 400°F), or othose that require special seals for chemical compatibility, �ǳ�web offers optional FKM seals. MTV-2 and MTV-3 are poppet valves. MTV-4 and MTV-5 are spool valves. MTV-5 valves are fully-ported.

Features:

• Compact, rugged construction
• Proven reliability
• Air, Water or Oil
• #10-32 or 1/8" NPT threaded
ports
• Brass body, Nitrile seals,
stainless steel stem and spring
• Steel or plastic toggles

Medium: Air, Water or Oil
Operating Pressure: 150 psig max.; MJTV-3: 300 psig max.
Mounting: 15/32-32 thread; nut and lockwashers included
Materials: Brass body, Nitrile seals, stainless steel stem and spring
Air Flow:
   MTV-2: 113 l/min @ 50 psig, 200 l/min @ 100 psig
   MTV-3: 113 l/min @ 50 psig, 190 l/min @ 100 psig
   MTV-4, MTV-5: 170 l/min @ 50 psig, 280 l/min @ 100 psig
Force to Rotate Toggle:
   MTV-2, MTV-3: 1.6 lbs. @ 0.0 psig inlet pressure
MJTV-3: 1.8 lbs. @ 0.0 psig inlet pressure
   MTV-4, MTV-5, MJTV-4, MJTV-5: 3.0 lbs. @ 0.0 psig inlet pressure

3-way valves have a supply, outlet and exhaust port. When the toggle is in the "on" position, air flows from the inlet to the outlet and the exhaust port is blocked. Moving the toggle to the "off" position closes the inlet and opens the outlet to the exhaust port which vents the outlet to atmosphere. 4-way valves can supply and exhaust two different outlets, and are commonly used with double-acting cylinders. When the toggle is in one position, air flows from the inlet to one of the outlets. The second outlet is open to the exhaust port which is vented to atmoshere. Moving the toggle to the opposite position opens the inlet to the second outlet while exhausting the first outlet. 4-way fully-ported valves can be plumbed in a dual pressure inlet configuration to save air consumption.

Tags:

MTV

MJTV

Toggle

�ǳ�web Knowledgebase - MTV

Comparing Poppet Valves vs. Spool Valves

What Are the Benefits of Poppet Valves?

What Are the Benefits of Spool Valves?

Poppet or Spool—Which Will Work Best for Your Application?

�ǳ�web MTV/MJTV Series Pneumatic Toggle Valves