13.10.2026 17:07
An elastomer seat gate valve fully opens and shuts off flow in water, wastewater, irrigation and fire lines, and it seals tightly via its elastomer-coated gate.
This guide explains how an elastomer seat gate valve works, which parts it consists of, the technical values in the Vanex Valve catalogue and what to check when selecting one.
1. How Does an Elastomer Seat Gate Valve Work?
When the valve stem is turned, the gate connected to the stem rises and the flow path opens completely. When the stem is turned in the opposite direction, the gate moves down, settles into its seat and shuts off the flow completely.
In the fully open position there is no narrowing in the flow path, so the pressure loss is low.
Gate valves are designed for fully open or fully closed operation, not for flow regulation (throttling).
2. What Does "Elastomer Seat" Mean?
In this valve type, sealing is provided by the elastomer coating on the gate. In the Vanex Valve elastomer seat gate valve, the gate is EPDM-coated ductile iron. When the valve closes, the elastomer-coated gate settles into its seat and shuts off the flow.
3. Where Is It Used?
Elastomer seat gate valves are used in lines where the flow has to be fully opened or fully closed. Application areas listed in the Vanex Valve catalogue:
Drinking water and treatment plants
Irrigation systems
Fire lines
HVAC systems
Industrial facilities
Building and infrastructure systems
4. Key Features
High sealing performance with the elastomer-coated gate
Suitable for bi-directional flow
Full bore design and low pressure loss
Low operating torque
Flanged connection
Epoxy-coated, corrosion-resistant body
Long service life and low-maintenance design
Suitable for manual (handwheel) or actuated operation
5. Technical Values (Vanex Valve Catalogue)
Pressure class: PN16
Size range: DN50 – DN300 (2" – 12")
Maximum operating temperature: 80 °C
Sealing: NBR / EPDM
Connection type: Flanged
Product type: Full bore
Face-to-face length and flange values by size are given in the dimension table on the product page and in the catalogue.
6. Parts and Materials
Body: Ductile iron (GGG40 / GGG50)
Bonnet: Ductile iron
Gate: EPDM-coated ductile iron
Stem: Stainless steel
Stem nut: Brass
O-ring, gland seal and gasket: EPDM
Handwheel: Ductile iron
Bolts and nuts: Steel
Surface coating: Electrostatic epoxy
Note: Material values are standard and may vary on request.
7. What to Check When Selecting
Line pressure: The operating pressure of the line must suit the PN16 pressure class.
Pipe size: The valve should be selected according to the nominal size of the line (within DN50 – DN300).
Fluid temperature: The maximum operating temperature in the catalogue is 80 °C.
Connection: The valve is flanged; check compatibility with the flange connection on the line.
Operation: Decide in advance whether the valve will be operated by handwheel or by an actuator.
Purpose: If the line needs flow regulation, a gate valve is not the right choice; gate valves are for full opening and full shut-off.
Frequently Asked Questions
Can an elastomer seat gate valve be used for flow regulation?
No. Gate valves are designed to fully open or fully shut off the flow, not to regulate it.
Which pressure class is the elastomer seat gate valve?
In the Vanex Valve catalogue, the elastomer seat gate valve is listed in pressure class PN16, in sizes DN50 – DN300.
What is the maximum operating temperature?
The catalogue gives a maximum operating temperature of 80 °C.
Can the valve be used for flow in both directions?
Yes. The elastomer seat gate valve is suitable for bi-directional flow.
For the dimension table, technical drawing and a price quote, please contact Vanex Valve.
