What is a double check non-return valve?
Brass 15mm double check valve (DCV) with two internal non return valve mechanisms, suitable for use in horizontal or vertical applications. This double check valve is a backflow prevention device designed to protect water supplies from contamination.
What is a double union valve?
A double union ball valve has, as implied, two unions on it – one on either side. The unions enable the valve to be unscrewed and removed from the pipeline, where it can be serviced or checked to see whether it’s blocked, and then easily put back in the pipeline where the unions can get screwed back on.
What is the difference between a single and double check valve?
A single check valve can be used for fluid category 2 protection, where there may be an aesthetic change such as temperature, taste or odour. A double check valve is used for fluid category 3 protection, where there is a risk of substances of low toxicity such as common disinfectants.
What are double check valves used for?
A double check valve is a backflow prevention device designed to protect water supplies from contamination. It consists of two autonomously acting, spring-loaded check valves. It includes shutoff valves at each end of the piece and very small ball valves.
What are union fittings used for?
A union is a threaded fitting which allows the pipe work to be separated and reconnected without any horizontal movement in the pipe. It can be a standalone pipe fitting connecting two pieces of pipe, or an integral part of another fitting (such as a ball valve) which allows it to be separated.
What is the function of union in plumbing?
When two ends of pipes are joined, the pipe fitting used is called union. A union is made of three parts namely a nut, a male end and a female end. The male and female ends are assembled with the support of the nuts, and necessary pressure is made to connect the joint.