The MECH os&y gate valve flange red ul/fm, model XZ41X, sizes 2.5″ – 24″ (DN65 – DN600), working pressure 300 PSI (200 / 250 PSI on request), UL / FM approved. A rising-stem gate valve whose position is visible at a glance: stem out means open. This guide explains what it does and how it works, related models, technical data, the critical point in selection and installation, and common mistakes. For more, read the guide OS&Y vs NRS gate valves.
At a glance
- An OS&Y (outside screw and yoke) gate valve lifts a gate inside the body with an external threaded stem running through a yoke.
- Sizes 2.5″ – 24″ (DN65 – DN600).
- Working pressure 300 PSI (200 / 250 PSI on request).
- Approvals: UL / FM.
- Connection: Flange ASME B16.1 CL125.
- Operating temperature: 0 – 80 °C.
OS&Y gate valve: what it does and how it works
An OS&Y (outside screw and yoke) gate valve lifts a gate inside the body with an external threaded stem running through a yoke. When opened the stem rises above the handwheel, so the valve position can be seen from a distance without a separate indicator.
Fully open, the gate is clear of the waterway, so pressure loss is very low. It is used as a control valve in valve rooms and on main supplies above ground, and takes a supervisory switch mounted on the yoke.
Related models
| Model | Product | Sizes | Pressure | Approvals |
|---|---|---|---|---|
| XZ31X | OS&Y GATE VALVE MECHANICAL JOINT UL RED | 2″ – 12″ | 300 psig | UL |
| XZ01X | OS&Y GATE VALVE FLANGE x MECHANICAL JOINT UL RED | 2″ – 12″ | 300 psig | UL |
| Z51X | GATE VALVE OS&Y FLANGE X GROOVE UL/FM RED | 2″ – 12″ (DN50 – DN300) | 300 PSI | UL / FM |
| XZ81X | OS&Y GATE VALVE GROOVED RED UL/FM | 2″ – 12″ (DN50 – DN300) | 300 PSI | UL / FM |
| XZ41X — this product | OS&Y GATE VALVE FLANGE RED UL/FM | 2.5″ – 24″ (DN65 – DN600) | 300 PSI | UL / FM |
Technical data
| Item | Specification |
|---|---|
| Connection ends | Flange ASME B16.1 CL125 |
| Working pressure | 300 PSI (200 / 250 PSI on request) |
| Temperature | 0 – 80 °C |
| Coating | FBE — ANSI/AWWA C550 |
| Approvals | UL / FM |
| Sizes | 2.5″ – 24″ (DN65 – DN600) |
Dimensions for every size are in the size table at the top of the page.
Clearance above the valve
Because the stem rises on opening, the valve needs headroom equal to its fully-open height. Check the open height in the size table before fixing its position; where headroom is limited or the valve is buried, an NRS valve is the choice.
Caution
A control valve must be supervised (switch, lock or seal per the standard). Fit the OS&Y supervisory switch and wire it to the panel.
Installation steps
- Check the end type and flange, groove or mechanical-joint standard for the model.
- Install with the stem vertical and upward where possible, leaving full stem rise clearance.
- Support the valve and adjacent pipe so the line weight is not carried by the valve.
- Cycle fully open and shut, then fit and adjust the supervisory switch.
Common mistakes
- No clearance left for stem rise.
- Leaving the valve unsupervised.
- Coating the stem with paint during site painting or lubricating it with unsuitable products.
Files and ordering
On this page: Product datasheet, MECH Fire Protection Valves Catalogue (UL/FM), Material Safety Data Sheet (MSDS). Add the product to your request list with size and quantity and we send a quotation, or build a submittal PDF for the consultant. Fu-Mech is the exclusive MECH agent in Saudi Arabia.
Frequently asked questions
What is the difference between OS&Y and NRS?
On an OS&Y the stem rises, so position is visible and headroom is needed; on an NRS it does not, suiting limited space and burial with an indicator post. See OS&Y vs NRS gate valves.
How do I know the valve is open?
If the stem stands fully out above the handwheel, the valve is open.
What is the working pressure of model XZ41X?
300 PSI (200 / 250 PSI on request) per the product data. The pressure for each size or listed model is in the size table and datasheet.
What approvals does it carry?
UL / FM per the product data. Check the size and listed model in the approval listings, and see how to verify UL and FM approvals.
What end connection does it have?
Flange ASME B16.1 CL125. Choose the connection that matches the adjacent pipe and fittings.
References
- ASME B16.1 — Gray Iron Pipe Flanges and Flanged Fittings
- AWWA C550 — Protective Interior Coatings for Valves and Hydrants
- MECH catalogue — Fire fighting valves
This guide is general information to help with selection. Figures come from the product data on this page and the MECH catalogue; final design is by the project’s approved designer to the applicable standards and the project specification.
