Valve Knowledge

Explore Spring-Loaded Safety Valve Types: Enclosed vs. Semi-Enclosed vs. Open. Understand differences, applications (toxic/flammable media, steam, air), key standards (GB/T12243), and models like A42H/Y, A48H/Y. Choose the right valve for safety & cost.

This guide explains knife gate valve standards (like JB/T8691, MSS-SP81), structure (bonnetless/bonneted, rising/non-rising stem), working principle (sharp, thin gate cuts fibers/seals flow in slurries/powders), and common models (Z73X-10, PZ673X, PZ973X, Z573X). It covers key sealing types (soft, hard, composite) and actuation (manual, pneumatic, electric) for handling tough media.

Kist Valve Group introduces the core structural features of forged steel gate, globe and check valves in detail, covering international standards such as API 602, ASME B16.34, etc. It also explains the advantages of forging process (high strength, no casting defects), split/integral body design, flange/butt-welding connection selection, pressure rating comparison and material selection guide, which is suitable for high-pressure scenarios in the oil and gas industry. Valve selection reference for oil and gas high-pressure scenarios.

Hydraulic control valve is a series of valves to realize water level control, pressure adjustment and other functions through the combination of the main valve and pilot valve, covering remote control float valve (100X), adjustable pressure reducing valve (200X) and other 9 types.

In the industrial piping system, check valve is the key equipment to prevent the backflow of media. Butterfly check valves and swing check valves, although similar in function, differ significantly in structural design, application scenarios, etc. Kist Valve Group will analyze the differences between these two types of valves in layman's terms for you.

Pressure reducing valves are divided into pilot-operated type (pilot valve indirectly controls the main valve, high accuracy/deviation ≤ 10%) and direct-acting type (direct feedback, deviation ≤ 20%). Pilot-operated type has complex structure and needs to be cleaned, while direct-operated type is simple and durable. Selection is based on precision requirements and working conditions.

Motorized ball valve that is by the valve electric device and ball valve two parts. Valve electric device as the power output part, drive the ball valve stem rotation, and then drive the ball core rotation. The medium for switching, regulating, directional, merging, shunting and other control. Has and transmission distance, signal sensitivity and high precision, easy to control, simple wiring and so on.

Low-lift safety valves open gradually (1/40–1/20 of seat throat diameter) with proportional pressure response, suited for liquids and low-pressure gases. Their discharge coefficient ranges 0.07–0.16, featuring compact seats (one size smaller than nominal diameter). In contrast, full-lift valves achieve rapid, full-opening (1/4 throat diameter) via a reverse-flow disk mechanism, delivering 5–10x higher discharge coefficients (0.7–0.8). Designed for steam/gas systems requiring fast pressure relief, they incorporate two-stage opening, snap-action reseating, and enlarged outlets (one size up). Structural distinctions include seat sizing (two sizes smaller for full-lift) and specialized models for high-efficiency applications.