Abstract
Gate valves have been widely used in the piping system and have attracted a lot of attention from researchers. In this paper, a wedge-type double disk parallel gate valve is chosen to be analyzed. The Reynolds number varying from 200 to 500,000, and the valve opening degree varying from 20% to 100%, and the groove depth varying from 2.3 mm to 9 mm are chosen to investigate their effects on the flow and loss coefficients of the gate valve. The results show that the loss coefficient decreases and the flow coefficient increases with the increase of the Reynolds number and the valve opening degree, while with the increase of the groove depth, the loss coefficient barely changes, but the flow coefficient increases if the Reynolds number is larger than 10,000. In addition, the effects of the gaps between the disk and the limit stop on the stress distribution of the bolt are also investigated, and the results show that if the gaps are negative, high stress will act on the bolt at the contact position between the bolt and the limit stop.
Highlights
As a kind of on–off valve, gate valves are widely used in various process industries
The stress analysis is done to uncover the possible reason for the gate valve failure
When water flows through the wedge-type double disk parallel gate valve, there is a pressure the loss coefficient, the smaller the valve flow capacity, but the greater the pressure drop
Summary
As a kind of on–off valve, gate valves are widely used in various process industries. Zhang et al [9] and Qian et al [10] focused on the dynamic valve open and close processes of a proportional valve, a pressure relief valve, and a pilot-control globe valve respectively. Long and Shurong [20] numerically investigated the flow and temperature distributions in the stem gate valve while using axisymmetric models, and. Hu et al [21] performed experiments and numerical simulations to study the temperature and the convection heat transfer coefficient distributions in a gate valve. The structural stress analysis where the valve failure might occur is done while using a numerical method that is proven by the previous studies [27,28,29,30,31]. This work is helpful for the understanding of the flow characteristics of the gate valve and the judgment of the reason for valve failure in the future
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