stvvalves

  How to Identification of BSPP,BSPT, NPT threads? When you choose valves and pipe fittings , thread is a very important feature you have to consider. No matter how well the product is made, a wrong thread type will make it useless. You have to determine the thread type before you order. British Standard Pipe fittings are among the most popular of all foreign threads in the world today. These threads come in two versions: parallel (BSPP), and tapered (BSPT). The thread flank angle for both tapered and parallel British threads is 55°. Although BSP is a foreign thread, it isn’t actually metric. This is why it comes in Imperial sizes: 1/8, 1/4, 1/2, 3/4, etc. BSP parallel (BSPP) threads commonly seal via a 30° chamfer on the male thread to a 30° cone seat inside the female thread (swivel only). If it is a port application, an O-ring and washer, Elastomeric seal or a bonded washer are needed to achieve a proper seal for parallel threads. For tapered BSP threads (BSPT), a seal is accomp...

A ball valve is a shut-off valve that uses a rotary ball with a bore to control a liquid or gas flow. The rotary ball is rotated a quarter-turn (90°) around its axis to allow or block the flow through the valve. These valves are mostly preferred for their longer service life and reliable sealing property. There are many options available in the market when it comes to the selection of ball valves. However, the wide range of operation, connection type, circuit function, housing material, and many other criteria make the valve selection process complex. This article will walk you through the ball valve selection process.  Before you embark on buying a ball valve for your shut off applications, this simple selection guide will help you choose the model that will effectively serve your purpose. This guide contains important factors to consider that will help you select the model that will be around for years to come without worrying of frequent replacements. Step 1: Operation Type The...