Dec 23,2019

Features of the Hidden-Valley Elastic Seat Gate Valve

Overview of the Hidden-Stem Elastic-Seated Gate Valve: The hidden-stem elastic-seated gate valve features an integral rubber coating on the entire valve body, which creates deformation compensation, ensuring a superior sealing performance. This design effectively addresses common issues found in conventional gate valves, such as poor sealing, leakage, and rusting, while also optimizing installation space. These valves are widely applicable across various fluid pipelines, including those for tap water, wastewater, construction, petroleum, chemicals, food processing, pharmaceuticals, light industry, power generation, shipbuilding, metallurgy, and energy systems—serving both regulating and shut-off functions. Key Features: - **Integral Rubber Coating**: The gate is fully coated with high-quality rubber, offering excellent adhesion and precise geometric dimensions to guarantee reliable sealing and extended service life. - **Lightweight Design**: The valve body is crafted from ductile iron, making it significantly lighter without compromising strength or durability.

Dec 23,2019

Principles and Precautions for Valve Pressure Testing

(1) Generally, valves are not subjected to strength tests unless they have been repaired. However, valve bodies and bonnets—or those that have suffered corrosion damage—must undergo strength testing after repair. For safety valves, the set pressure, reseat pressure, and other relevant tests must comply with the manufacturer’s instructions and applicable regulations. (2) After valve installation, both strength and tightness tests should be conducted. For low-pressure valves, a random 20% inspection is sufficient; if any fail, 100% inspection is required. In contrast, medium- and high-pressure valves must undergo 100% inspection without exception. (3) During testing, valves should be installed in positions that allow easy access for inspection. (4) For valves with welded connections, if blind flange testing is not feasible, alternative sealing methods such as tapered seals or O-ring seals may be used instead.

Dec 23,2019

Comparing the Differences Between Elastic Soft and Hard-Sealed Gate Valves

Hard sealing involves a metal-to-metal seal, where both the sealing sphere and the valve seat are made of metal. This type of sealing requires high machining precision and sophisticated manufacturing processes, making it typically suitable for high-pressure applications—usually above 35 MPa. In contrast, soft sealing uses a metal-to-nonmetal interface, such as nylon or PTFE, and follows the same manufacturing standards as hard sealing. First, regarding the sealing materials: Elastic soft-sealed gate valves and hard-sealed gate valves differ primarily in the material used for the valve seat. Hard sealing relies on precisely machined valve seat materials to ensure tight tolerances when paired with the valve’s core (the sphere), commonly made from stainless steel or copper. On the other hand, soft sealing refers to nonmetallic materials embedded within the valve seat, which provide flexibility while maintaining effective sealing performance.

Jun 22,2017

Advantages and Disadvantages of Globe Valves, Plus Installation Tips

Gate valves offer the following advantages: 1. Simple design, making them easy to manufacture and maintain. 2. Shorter operating stroke and quicker opening/closing times. 3. Excellent sealing performance, with minimal friction between sealing surfaces, resulting in a longer service life. However, gate valves also have some drawbacks: 1. High fluid resistance, requiring greater effort to open and close. 2. Not suitable for media containing particles, highly viscous fluids, or substances prone to coking. 3. Poorer throttling capabilities compared to other valve types. Gate valves can be classified based on the position of the valve stem threads—either external thread type or internal thread type. Additionally, they are categorized by the flow direction of the medium into straight-through, direct-flow, and angle-type designs. Finally, gate valves can also be differentiated by their sealing mechanisms, including those with packing gland seals and those featuring bellows seals.

Jun 22,2017

Valve Position Detection and Analysis in Modern Process Installations

In the process industry, valves and actuators have long been used for controlling and directing liquid flow. Increasingly, plant engineers are seeking feedback signals from valves, taps, and actuators regarding their current positions within the control system. Typically, these signals are obtained either through proximity sensors embedded in the switch boxes or via dual sensors—installed directly on the actuator or manual valve itself. This article delves into the types of sensors being applied in response to emerging trends both in the field and in the market.

Apr 14,2015

Working Principle of a Double-Acting Pneumatic Butterfly Valve with Dual-Coil Solenoid Valves

The working principle of a double-acting pneumatic valve equipped with a 2/5-way, dual-coil solenoid valve: The dual-electrically controlled solenoid valve manages the opening and closing of the valve by energizing or de-energizing its two solenoid coils. When one coil is de-energized while the other remains energized, the valve spool stays in its current position—this feature is known as the valve's "memory function." 1 Port: Air supply inlet, 5 kg pressure

Apr 14,2015

The valve industry market is highly attractive, with prospects widely viewed positively by industry insiders.

Recently, a news item about "valves and money" has captured the attention of many: Hong Kong will issue a valve-themed currency note with a face value of 10 Hong Kong dollars this June. After the story was reported by the media, it quickly sparked widespread curiosity about the valve-shaped banknotes.

Apr 13,2015

2015-2020 China Stainless Steel Double-Flanged Butterfly Valve Industry Market Analysis and Industry Development Trends Report

Report Overview: This report provides a comprehensive analysis of the stainless steel wafer-type butterfly valve market, covering various perspectives—including global developments in international stainless steel wafer valves, the domestic policy environment and growth trends for these valves, R&D advancements, import-export dynamics, key industry players, as well as existing challenges and potential solutions.

Apr 13,2015

Reasons for a Pneumatic Control Valve Receiving an Input Signal but Not Actuating, and Troubleshooting Methods

There are many reasons for pneumatic control valve failures, so it’s essential to implement appropriate troubleshooting methods to effectively extend the service life of pneumatic valves.

Apr 13,2015

Pressure Loss and Flow Resistance Coefficient of Pneumatic Butterfly Valves

The flow resistance coefficient of a pneumatic butterfly valve refers to the fluid pressure drop across the valve as the fluid passes through it—specifically, the loss in fluid energy due to friction and turbulence. The flow resistance coefficient of a butterfly valve depends on factors such as the valve's size, structural design, and internal cavity shape. To illustrate how valves influence fluid resistance, we’ve included reference data for common valve components, which clearly demonstrate the relationship between a valve element’s geometry and dimensions—and its resulting impact on fluid flow resistance.