How to Replace a Shutoff Valve

Shut off valves are also called as cut-out cocks. These types of valves have a wide application in almost all services. Shut off valves are widely used in air supply applications, drinking water application, oils and gas application, liquid fill or vent valve on cryogenic tanks as well as LNG fueling either as a protection device or as a control device.

Shut-Off Valves

The shut off valves are of three types, the sweat valve, the threaded valve and the compression valve. Shut off valves undergo frequent handling, which may cause problems after years of use. Rather than repairing the valve, it is beneficial to replace the shutoff valve so that the leakage, mineral deposit and corrosion problem does not reappear for years.

Tools required to replace cryogenic valves

• Pliers
• Wrench
• Soldering torch
• Shut-off valve

Here is a step by step guide to replace the shutoff valve

1. Shut-off valves are usually connected to copper pipe by compression fitting or sweat fitting. Shut off the water by shutting the shutoff valve. Shut the electricity by shutting the circuit breakers. Drain out the water by opening the faucet. Remove the supply tube and replace the shutoff valve
2. Identify the type of valve fitting. If it is a sweat valve, hold the valve with pliers, unscrew the valve system by loosening the packing nut. Remove the washer if it’s stuck in the seat. Use the flame, if required to remove the valve
3. Clean the tubing, solder the valve and sand off the traces of the solder
4. To replace a compression shutoff valve, cut the sleeve at an angle and hack using short strokes so as not to cut the copper tubing. Remove the valve body with a wrench. Loosen the nuts, then pull off the valve from the copper tubing
5. Slide the new compression nut and the sleeve onto the tubing. Insert the shutoff valve and screw the nut snugly into the new valve. Follow the instruction of the manufacturer as to how many turns the nut should be tightened

Shut-off valves-extended stem valves are available at JTC valve sales. These extended stem valves are designed to be used as trycock valve or hose drain valve on cryogenic tanks. The one piece stainless steel stem, union bonnet and conical seat design allow the shutoff valve to work efficiently at pressures up to 600 psig at temperature ranging from -320 degree F to +165 degree F. This shutoff valve-extended stem is cleaned for oxygen service as per CGA G-4.1.

JTC valve sales offers a complete range of valves, regulators and hoses for every application. When you buy from this leading portal, you not only get free shipping in the continental USA, but highly reliable, factory tested products that are made in the USA.

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