Offers no resistance to flow when fully open
When the wedge is fully raised, a bore equal to the line cross-section is achieved; this keeps pressure loss to a minimum and contributes to energy efficiency.
Ürün grubu · Vana Grubu
Gate Valves
Gate valves are full-bore shutoff valves that open and close the line through the motion of a wedge-shaped gate perpendicular to the flow axis. In the fully open position they offer almost no resistance to flow, so they are used only for shutoff (isolation), not regulation. As Denfor Endüstriyel, we supply solid-wedge and flexible-wedge, as well as rising-stem (OS&Y), gate valves, with body and connection options suited to large-diameter water, steam and process lines.
Line diameterDN50 – DN800
Pressure classPN10 / PN16 / PN25
Gate typeSolid wedge / flexible wedge
ConnectionFlanged
Why it matters
What does a gate valve do?
In the fully open position it offers almost no resistance to flow, providing full-bore shutoff on large-diameter lines.
Reliable isolation on large-diameter lines
The standard valve type chosen for large-diameter water and steam lines that must be fully shut off during maintenance, repair or a fault.
For shutoff only, not regulation
Since fluid turbulence in a partially open position can erode the wedge surface, it is designed only for a fully open/fully closed function, not for flow regulation.
OS&Y (rising-stem) and non-rising stem options
The OS&Y type is preferred in applications such as fire lines where the stem position must be visible from outside, while the non-rising stem type is preferred where space is limited.
Types
Sub-types of gate valves
All three shut off the line through wedge motion; what sets them apart is the wedge structure and stem position.
Solid-wedge gate valve
Operating with a single-piece solid wedge, the standard choice for medium-pressure-class water and process lines.
- Single-piece wedge
- Medium pressure class
- Water lines
Flexible-wedge gate valve
Built with a flexible (springable) structure so the wedge conforms better to the body seat; preferred on steam and high-temperature lines.
- High sealing
- Suited to steam lines
- Tolerant of temperature change
Rising-stem (OS&Y) gate valve
The stem moves outward as the valve opens; preferred on fire water and critical isolation lines where the position must be visible from outside.
- Visible position indicator
- Fire-line compatible
- Critical isolation points
Selection criteria
What data determines the right gate valve?
Selection isn't possible without the first two items. The rest determine the wedge structure and stem type.
ParametreNeden belirleyiciBizden istenen
Line diameter
Determined by the nominal diameter of the existing pipeline.
DN size
Pressure class
The PN class is chosen to match the line's operating pressure.
PN10 / 16 / 25
Fluid type and temperature
Determines the wedge structure (solid/flexible) and gasket material.
°C + fluid type
Stem type
Whether the position needs to be visible from outside.
OS&Y / non-rising stem
Intended use
Whether it is for isolation only, or an emergency shutoff.
Isolation / emergency shutoff
Connection size and mounting location
Flange size and installation clearance.
DN size + mounting clearance
Teklif için elinizde şunlar varsa yeter
Hepsi olmasa da olur. Eksik kalanları sizinle birlikte tamamlarız.
Create a quote request- Line diameter (DN size)
- Pressure class (PN)
- Fluid type and operating temperature
- Stem type preference (OS&Y/non-rising stem)
- Intended use (isolation/emergency shutoff)
- Nameplate data of the existing valve (if a replacement)
FAQ
Questions from the field
The questions we hear most often when quoting gate valves.
Can a gate valve be used for flow regulation?
No. In a partially open position, fluid turbulence erodes the wedge surface; a globe valve or a proportional control valve should be used for flow regulation instead.
What is the difference between OS&Y and non-rising stem?
In the OS&Y (Outside Screw & Yoke) type, the stem moves outward as the valve opens and its position can be seen from outside; in the non-rising stem type the stem stays inside the body, which is preferred where space is limited.
When is a flexible wedge required?
On steam and high-temperature lines where temperature changes make it harder for the wedge to seat fully against the body seat, a flexible wedge provides more reliable sealing.
On which lines is it preferred?
It is preferred in applications requiring full-bore isolation with minimum resistance to flow, such as large-diameter water distribution lines, steam lines and fire water lines.
Do you only serve Istanbul?
No. While our office is on Istanbul's Anatolian side (Ataşehir), we supply and ship across Istanbul's European side, the surrounding provinces and the Marmara region, and Turkey as a whole — covering your equipment end to end, from a single source.
Next step
Let's pin down what you need, together
Share your line diameter and pressure class, and we'll work out the right gate valve for your line together.
Related products
Other related product groups
Complementary equipment you may need for your project.