OS&Y Rising Stem Valve
An OS&Y (outside screw and yoke) rising stem valve is a gate valve whose stem rises out of the body as the handwheel turns. The visible stem length shows from a distance whether the valve is open or closed, which is why it is the preferred main control valve in fire systems.
According to the manufacturer catalogue it is offered in 2″–24″ with flange-flange, flange-groove and groove-groove ends. The store range includes DN50–DN300 DIN and ANSI flanged, 2″–12″ grooved and 1″–2″ threaded models.
Main Applications
- Main control valve of sprinkler systems
- Fire pump suction and discharge isolation
- Alarm valve station inlets and outlets
- Hydrant network sectional valves
- Water tank outlet lines
Technical Data
| Type | Rising stem gate valve (OS&Y) |
|---|---|
| Size | 2″ – 24″ (manufacturer catalogue) |
| Flanged | DN50 – DN300, DIN or ANSI flange (product range) |
| Grooved | 2″, 2½” (73 / 76.1 mm), 3″, 4″, 5″, 6″ (165.1 / 168.3 mm), 8″, 10″, 12″ (product range) |
| Threaded | 1″, 1¼”, 1½”, 2″ (product range) |
| Pressure class | 175 psi – 300 psi (manufacturer catalogue) |
| Body and bonnet | Ductile iron, ASTM A536 (manufacturer catalogue) |
| Stem | Stainless steel, AISI 420 (manufacturer catalogue) |
| Sealing | EPDM O-ring and gasket (manufacturer catalogue) |
| End options | Flange–flange, flange–groove, groove–groove (manufacturer catalogue) |
Material Options
| Part | Flanged | Grooved |
|---|---|---|
| Body | Ductile iron ASTM A536 | Ductile iron ASTM A536 |
| Bonnet | Ductile iron ASTM A536 | Ductile iron ASTM A536 |
| Stem | Stainless steel AISI 420 | Stainless steel AISI 420 |
| Gasket | EPDM O-ring and gasket | EPDM O-ring and gasket |
| End | DIN or ANSI flange | Coupling groove |
Which material? On flanged models the DIN (PN16) or ANSI drilling is chosen to match the mating flange; a tamper switch fitted to the stem for position monitoring is supplied separately.
Advantages
Remote Position Indication
- Stem length shows open/closed state
Full-Bore Flow
- Gate stays out of the flow when open
Three End Types
- Flanged, grooved and threaded bodies
Ready for Supervision
- Tamper switch can be fitted to the stem
Construction and Design Features
- Outside-screw stem rising through the yoke
- Ductile iron body and bonnet
- EPDM-encapsulated or gasketed gate (by model)
- Manual handwheel operation
Send the size, end type and flange standard; we will quote the OS&Y valve with the tamper switch option.
How to Choose?
- Define the endsChoose DIN or ANSI on flanged lines and grooved ends on grooved lines.
- Confirm the sizeCheck the pipe OD on grooved 2½” and 6″ lines.
- Select the pressure classPick the class that covers the pump shut-off pressure.
- Add supervisionPlan a stem tamper switch on zone valves.
Complementary Products
Why ORFA?
Other Water Fire Suppression Systems
Flow Switch
Flow switches send a signal to the alarm panel when water starts flowing in the sprinkler line, indicating a fire.
Details →
Flow Meters
Flow meters measure the flow delivered by the fire pump on pump test lines.
Details →
Pressure Relief Valve
Pressure relief valves protect the installation by discharging excess water when overpressure occurs in fire pump systems.
Details →Deluge Alarm System and Equipment
Deluge alarm systems supply water simultaneously to open sprinkler or nozzle lines upon a detection signal.
Details →Wet Alarm Valve System and Equipment
Wet alarm valve systems are the main control valve and equipment that raise an alarm when a sprinkler opens in water-filled sprinkler lines.
Details →
Fire Department Suction Connection
Fire department suction connections are connection points that allow fire trucks to draw water from a reservoir or installation.
Details →
Fire Department Inlet Connection
Fire department inlet connections allow fire trucks to pump water into the building fire installation from outside.
Details →
Butterfly Valve with Limit Switch
Butterfly valves with limit switch report the valve position to the alarm panel in fire protection lines.
Details →Dry Alarm Valve System and Equipment
Dry alarm valve systems are valves and equipment controlling sprinkler lines filled with pressurized air in areas at risk of freezing.
Details →
NRS Non-Rising Stem Valve
NRS non-rising stem valves are fire line gate valves whose stem does not rise, suitable for limited spaces.
Details →
NRS Valve Supervisory Switch
NRS valve supervisory switches report the open or closed position of non-rising stem valves to the fire alarm panel.
Details →OS&Y Valve Supervisory Switch
OS&Y valve supervisory switches detect the position of rising stem valves and report it to the fire alarm panel.
Details →
Preaction Systems
Preaction systems release water into the piping only after a detection signal, used where accidental discharge must be avoided.
Details →
Post Indicator
Post indicators allow underground fire line valves to be operated from above ground and show their position.
Details →
Test and Drain Valve
Test and drain valves allow flow testing and draining of sprinkler lines.
Details →
Waste Cone
Waste cones direct water from test and drain lines to the drain in a visible way.
Details →
Fire Check Valve
Fire check valves are approved check valves that prevent backflow in fire protection installations.
Details →
Fire Hose Cabinets
Fire hose cabinets house the hose, nozzle and valve together and are used for first response in buildings.
Details →
Fire Systems Pressure Reducing Valve
Fire systems pressure reducing valves lower excess pressure on lower floors of high-rise buildings to a suitable value for fire equipment.
Details →
Fire Sprinklers
Fire sprinklers open when the ambient temperature rises and automatically spray water onto the fire area.
Details →
Fire Valves
Fire valves are approved valves used to open and shut off lines in fire protection installations.
Details →
Above Ground Fire Hydrants
Above ground fire hydrants are outdoor hydrants that allow fire crews to draw water from the mains.
Details →
Grooved Pipe Fittings
Grooved pipe fittings allow fast assembly with couplings, without welding or threading, in fire and general installations.
Details →Get a quote for your project
Our sales team will prepare the best solution for your needs.