Carbon Steel Gate Valve
Carbon Steel Gate Valves are multi-purpose bi-directional shutoff valves for commercial and industrial applications. Carbon Steel Gate Valves are with assurance of the warranty, along with superior customer service expertise.
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Key Specifications / Features
Carbon steel gate valves serve as efficient stop valves with flow in either direction. Gate valves are manufactured in accordance with ANSI classes 150, 300, 600, 800, 900, 1500 & 2500 # and sizes from 1/2” up to 72” nominal diameter, provides the end user a wide variety of valves to satisfy their needs.
The carbon steel gate valve is a great solution for high pressure, gas, water, oil, paper/pulp with API 600 & API 602 standards. Carbon steel body material Forged steel body also available.
Carbon steel is a metal alloy. It is a combination of two elements, iron and carbon. Other elements are present in quantities too small to affect its properties. The only other elements allowed in plain-carbon steel are: manganese (1.65% max), silicon (0.60% max), and copper (0.60% max)
Main Carbon Steel
Cast Carbon Steel: A216 WCB, WCC;A352 LCB, LCC
Forged Carbon Steel: ASTM A105, A105N, LF2
The trim material is SS304, SS316, 13Cr, Stellite 6 etc.
Gate valves are primarily designed to start or stop flow, and when a straight-line flow of fluid and minimum flow restriction are needed. In service, these valves generally are either fully open or fully closed. The disk of a Gate valve is completely removed when the valve is fully open; the disk is fully drawn up into the valve Bonnet. This leaves an opening for flow through the valve at the same inside diameter as the pipesystem in which the valve is installed. A Gate valve can be used for a wide range of liquids and provides a tight seal when closed. There are three different disks or wedges available for Gate valves, solid wedge, flexible and split wedge. Ranging of the Gate valves is usually made by the type of wedge used.
Flexible Wedge Disc:
The wedge type disk can also be obtained in a flexible design, developed primarily to overcome sticking on high-temperature services subject to great temperature changes. In one form the single piece construction of the disk is maintained but the two seating faces are separate from each other except for a short connecting axle or spud at the centre of the disk. In this way, each disk face is permitted a certain degree of independent movement which, besides eliminating the possibility of sticking in the closed position, facilitates tightness on both the upstream and downstream sides of the disk over a wide range of pressures and temperatures.
There are three basic designs of stem arrangements Inside screw (rising stem), Inside screw (non-rising stem) & Outside screw (rising stem) The first mentioned is relatively the least expensive and is most commonly found on the smaller sizes of valves. A useful feature is that the position of the stem serves to indicate the position of the disk. Because the stem threads are inside the valve body and so open to attack by the service fluid, inside screw valves are not usually used for fluids having corrosive or erosive properties or for high-temperature services where consequent expansion and contraction may cause binding of the threads. In the case of the inside screw, non-rising stem design, the stem does not move axially but merely rotates. This arrangement is particularly useful where headroom is limited. Also, the elimination of the up and down movement of the stem reduces the amount of wear on the gland packing. On the outside screw, rising stem valve, the stem threads are situated outside the valve body and so are not subjected to possible effects of the pipeline fluid. The stem threads are accessible for lubrication and the position of the stem provides an indication of the amount of valve opening. Adequate headroom is required for the rising stem, for which some form of protection should be arranged to guard against possible damage.
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