Design Construction

Design Features

Design more economical, flexible, and compact fluid handling systems.
Bi-directional flow, simple actuation, lightweight, compact design, and multiport configurations all facilitate improved system design.
Superior, longer-lasting in-line sealing.
The inert PTFE sleeve completely surrounds the plug. The sleeve provides a large, circumferential sealing surface from port to port. Open, closed, or rotating, the seal is assured. No ball or gate valve can match this sealing power.
Secure sealing with no cold-flow, deformation, or rotation of the sleeve. 
The sleeve is securely nestled in the valve body. High pressure ribs, top and bottom retention, and 360° port lips all assure sleeve containment.
No seizing. No sticking. 
As the plug rotates, the 360° port lips provide a self-cleaning action to remove scaling and adhering media.
No cavities. No contamination. 
There are no body cavities where flow media can accumulate and contaminate future processing. This cavity-free design also prevents sticking.
 

Design For Stem Sealing
There’s a fully adjustable in-line seal and dual stem seal.
 

Special sealing design for heavy duty

Control fugitive emissions.
This optional top seal package provides exceptional control of fugitive emissions. It meets or exceeds the most stringent curent regulatory requirements.
Triple sealed for extra protection.
Under normal conditions, there are three active seals between the flow media and the atmosphere. Primary sealing is provided bythe interaction of the plug, sleeve, and body. Secondary sealing is provided by the PTFE and metal diaphragms.Tertiary sealing isprovided at the stem by the encapsulated, flexible graphite stem seal and at the body/cover joint by the graphite cover seal ring.
This simple system assures stem sealing.
This simple, compact, patented design harnesses complex dynamic forces to assure effective sealing to atmosphere. The metalic cartridge totally encapsulates the flexible graphite tertiary dynamic stem seal At its outer edge, the metal diaphragm overlaps the graphite static seal ring to reinforce the tertiary seal at the body-to-cover joint. The PTFE wedge ring concentrates the sealing force of the PTFE diaphragm radially againstthe valve stem for more reliable prevention of external leakage at this secondary seal.

 

Fire Safe And Anti-Static Functions

API-607 Standards.
For External Leakage. These valves exceed the sealing requirements specified in those standards. A tight external seal was maintained even after the PTFE sleeve and sealing parts were totally destroyed by fire.
Fire tested stem seal.
A metal diaphragm overlays the PTFE diaphragm and a Graphite packing surrounds the stem. If the PTFE diaphragm and wedge ring are destroyed by fire, the metal diaphragm and graphite packing maintains the seal.
Fire tested cover seal.
In the standard valve, if the PTFE sleeve and diaphragm are destroyed by fire, leakage would occur at the cover joint. The flexible graphite cover seal prevents this. It is fitted into a machined counter bore in the valve body. The cover bolts compress the graphite ring between the valve body and cover. Even if fire occurs, this seal is maintained.
Vented plug.
In fire tested valves, the plug is vented on the upstream side. This relieves the expansive pressure caused by the heat of the fire. Valves with vented plugs are unidirectional. An arrow stamped on the valve body indicates the flow direction.
 

Multiport valves
VETZ-FLOWTECH Multiport Sleeved Plug Valves bringeconomy and more compact system design tothousands of applications.

Bi-directional flow for more flexibility.
In the diagrams the color indicates the path of fluidflow. Bi-directional flow permits more system design options.


3-way arrangements.
Only the Type A plug will shut off the flow. With the Type AX, C, and D plugs, there is always flow between the bottom port and one of the side ports.


4-way and 5-way valves.
For optimum system flexibility 4-way and 5-way multiported valves are available. For details such as sizes available and dimensional information contact the factory.