Use the search bar above for Site Contents, Instruction Manuals, and Product IDs.
To Top


Maintenance Gate

The Vortex® Maintenance Gate is designed to shut off material from a hopper or silo when maintenance of downstream equipment is required. In the open position, it positively seals conveying air and material to atmosphere. The hand crank gearing is designed to close through material in case of an upset condition.

Ideal application: Shut off material flow when maintenance of downstream equipment is required or if an upset condition occurs.

Key Features

  1. PTFE-treated bonnet packing gland, for greater wear resistance and longer service life

  2. Non-rising stem, for easier manual actuation

  3. Hand crank actuation, as a standard

  4. Designed to close through a standing column of material in the case of an upset condition

  5. Optional Special Service Inlet to protect the seals from abrasion

  6. Bonnet cover constructed from clear polycarbonate, for operator safety and to protect the gate from its environment

  7. Constructed from specialized metals and polymers for application-specific durability

  8. No internal cavities to prevent wedging, lodging & spoilage

  9. Narrow profile for limited space applications

A PTFE-treated bonnet packing gland
PTFE-treated bonnet packing gland, for greater wear resistance and longer service life
A non-rising stem on the Maintenance gate.
Non-rising stem, for easier manual actuation
Hand crank actuation on the Vortex Maintenance Gate.
Hand crank actuation, as a standard

Tech Specs

Model No.


Conveyance Type

Gravity flow and dilute phase pneumatic conveying applications. Can handle differential pressures up to 15 psig | 1 barg | 0.1 MPa, depending on gate size. Can be used in pressure or vacuum systems.

Materials Handled

Non-abrasive to moderately abrasive powders, pellets and granules. Well-suited for handling corrosive materials and/or for wash-down.

Standard Sizes

6 – 20 in | 150 – 455 mm
ID & OD diameters are available.
Contact us for custom sizes.


Available in square or rectangular sizes. Round transition options are available

Overall Height

5 – 6 in | 115 – 140 mm


15 – 200 lb | 5 – 90 kg

Flange Options

Standard stud bolt pattern, DIN PN10, ANSI #125/150
Custom flanges are available

Material Temperatures

180° F | 80° C for standard gate, with modifications that allow up to 400° F | 205° C

Body/Frame Options

6061-T6 aluminum, painted carbon steel

Material Contact Options

304 or 316L stainless steel, carbon steel

End & Side Seal Options

Nylon, PET, UHMW-PE, 25% glass-filled PTFE

Bonnet Seal Construction

Bonnet seal cartridge with PTFE-treated packing gland

Clevis Construction

Ratio 5:1 ACME threaded rod


Hand wheel/crank, chain wheel

Position Confirmation

Clear bonnet cover for visual indication and/or proximity switches

Other Options

Special Service Inlet


ATEX Zone 20 (internal), ATEX Zone 21 (external), FDA



Blade and gate liner are made of 304 stainless steel.


Blade and gate liner are made of 316L stainless steel.


Modifications are made allowing 400 F (204 C) continuous to 450 F (232 C) intermittent service.


Gate blade is electropolished. Polyethylene (PET or UHMW) pressure plate seals are used to replace nylon.

*Additional modifications available based on application.


Options on the Maintenance Gate. 1. Square, 2. Round

Power of Comparison

Vortex Maintenance Gate vs. Alternatives

The design and construction of the Vortex® Maintenance Gate offers significant advantages over traditional carbon steel maintenance gates.

• The Maintenance Gate’s aluminum body and frame make it lightweight and corrosion-resistant. The gate’s stainless steel material contact areas provide additional resistance to corrosion and wear. This provides the Vortex Maintenance Gate with long-term and reliable service.

• Many alternative maintenance gates allow metal-on-metal sliding, which creates galling. This causes a gate to seize and bind, and can create foreign metal fragment contamination. The Maintenance Gate's hard polymer liners eliminate metal-on-metal contact to resolve each of these concerns.

• Many alternative maintenance gates rely on soft rubber seals which are directly exposed to the material flow stream. These seals rapidly erode or tear away in service. This deficiency promotes leakage of materials and dusts past the gate and to atmosphere, in addition to actuation issues and several other maintenance concerns. The Maintenance Gate addresses these issues by incorporating a bonnet seal cartridge, which houses a PTFE-treated packing gland. PTFE-treated packing gland provides greater wear resistance and longer service life than alternative sealing materials. Within the bonnet seal cartridge, the packing gland expands to create a dust-tight seal around the vertical perimeter of the blade. The bonnet seal cartridge shields the packing gland from the material flow stream, to protect it from abrasion. This design maintains the gate’s positive seal with infrequent maintenance intervention. Once the packing gland has experienced significant frictional wear, it can be removed and replaced to restore the gate’s dust-tight seal. This maintenance process can be performed while the gate remains in-line.

• The Maintenance Gate’s stainless steel blade and hard polymer liners are FDA-compliant. This makes it an excellent choice in food handling applications and other applications where carbon steel and aluminum are not acceptable for material contact.

Join our newsletter and receive Vortex news & updates in your inbox.

Success! Thank you for subscribing.
Oops! Something went wrong while submitting the form.
Vortex Companies
Salina Vortex Corporation © Copyright 2022 - All Rights Reserved