April 29, 2021
Stop Cocks are installed in systems to isolate flow, and should not be used as control or regulating valves. By turning the stem, the gasket inside the valve moves up and down to either interrupt or facilitate the flow of the system.
Unpack and check that the valve is correct for its intended usage. The valve must be compatible with the system design, pressure & temperature requirements and must also be suitable for the fluids it is intended to carry. Check that the flow paths are clear and that the threads are free from debris. To ensure ease of operation, maintenance and repair, the location of the valve should be decided during the system design phase. Valves should be appropriately supported to prevent strain on the valve and the pipework.
Stop Cocks perform best when they are installed in an upright position.
Ensure that the fitting is the correct size for the pipe and that the pipe is cut to length with the ends square and clear from defects. Unscrew the nut and olive and slide onto the pipe. Insert the pipe into the fitting as far as the pipe stop.
Slide the olive and nut back onto the fitting and tighten by hand until the pipe cannot rotate. Use spanner flats adjacent to the pipe joint being made.
| Size | Turns |
|---|---|
| < 28mm | 1 1/4 Turns |
| Size | Torque |
|---|---|
| 15mm | 30 - 35 Nm |
| 22mm | 45 - 50 Nm |
| 28mm | 55 - 60 Nm |
We recommend that all systems are throughly tested upon completion. Whenever possible, completed systems should also be flushed to remove debris.
Regular maintenance is the most efficient method of ensuring longer term uninterrupted operational efficiency. It is recommended that within the 1st year that valves should be visually inspected for leaks and that a complete manoeuvre cycle is carried out to check the valve and prevent scale from forming every 3 months. Where a valve is working under extreme conditions it is recommended to check it more frequently.
In hydraulic based installations, the system may be tested to 1.5 times the working pressure of the system. If higher test pressures are required, then please contact us for further advice.
Our team is available for you anytime.