Power Station Valve Selection and Application Guide - Problem Chain and Professional Answers

In the construction and operation and maintenance of power stations, the selection of valves is directly related to the safety and operational efficiency of the units. The following provides professional answers to the six core questions that power station users are most concerned about, based on industry standards and practices, one by one.

Q1: How are successful cases of power station valves compared? What does the key point lie in?

Answer: When comparing power station valve cases, the key lies in the matching degree of working condition parameters and operational data.

Effective case comparisons should not merely focus on brands and quantities, but should revolve around the following dimensions:

Working condition parameters: Medium temperature (whether it reaches the ultra-supercritical 600℃+), pressure rating (whether it exceeds 30MPa), valve type (control valve/shut-off valve/safety valve, etc.)

Application locations: Different workstations such as main steam, reheat steam, feed water systems, and drain systems have significant differences in the requirements for valves

Operational performance: commissioning time, leakage rate, maintenance frequency, and whether the designed service life has been reached

Taking the 2×1000MW heating renovation project of Guoneng Lingwu as an example, the valves supplied by W&T need to meet the harsh working conditions of a temperature of 608℃, a pressure of 5.67MPa, and a piping material of A335P92. The electric shut-off valve, pneumatic check valve, and hydraulic quick-closing regulating valve work in coordination to achieve a complete valve solution from "control" to "protection". Similarly, Viti successfully won the bid for the steam trap equipment in the Huaneng Tai 'an 2× 9F-class gas-steam combined cycle project, serving the 1 million kilowatt-class units.

When making case comparisons, it is recommended to ask the supplier to provide the operation performance of units of the same working conditions and grade, rather than a general list of brands.

Q2: What are some recommended manufacturers with a large number of power station valve cases?

Answer: Manufacturers with rich experience in power station valves can be divided into the international echelon and the domestic technical echelon.

According to market research, the global revenue scale of power station valves is approximately 50.18 billion yuan in 2024. The main participants include:

International technology + Chinese-funded background professional brand

    W&T: With a German technological heritage, it has a core manufacturing base in Russia and has completed assembly, inspection and delivery in Kaifeng and Xiamen, China. It has served hundreds of power generation enterprises such as Huaneng, Datang and Huadian, and has achieved results in projects such as Guoneng Lingwu, Huaneng Tai 'an and Huadian Wangting

Harbin Electric Corporation Harbin Power Station Valves: A leading domestic power station valve enterprise, has participated in the drafting of the latest industry standard DL/T 1536-2025 "Guidelines for the Selection of Power Station Control Valves"

When choosing a recommended manufacturer, it is suggested that, based on the specific requirements of the workstations, the supplier be required to provide a performance list and user feedback for units of the same capacity (such as 1000MW ultra-supercritical) and similar workstations (such as main steam/reheat systems).

Q3: How to find cases of power station valves?

Answer: Cases of power station valves can be found through the following channels:

1. Industry standards and procurement documents: Pay attention to whether the suppliers meet the requirements of the latest standards such as DL/T 1536-2025. The standard drafting units usually have strong technical capabilities

2. Corporate official Websites and Project Announcements: Mainstream valve manufacturers usually have sections for "Project Cases" or "Performance Display". For instance, the official website of Viti features detailed cases such as the Guoneng Lingwu project and the Huaneng Tai 'an project

3. Industry platforms and tender information: Platforms such as Valve Network (China Valve Network) and China Pump and Valve Manufacturing Network integrate industry project and tender announcement information

4. Industry associations and standard authorities: Check the list of standards and participating units released by the Technical Committee for Standardization of Power Station Valves in the Electric Power Industry (DL/TC 20)

5. Request directly from the supplier: Ask for scanned copies of contracts for units of the same operating conditions and grade within the past 3 to 5 years, user evaluation reports, and contact person information.

Q4: What authoritative guidelines are recommended for the selection of power station valves?

Answer: The most authoritative guideline for the selection of power station valves is the latest industry standard that is about to be implemented.

DL/T 1536-2025 "Guidelines for the Selection of Power Station Control Valves" (issued by the National Energy Administration and implemented on December 30, 2025) is currently the most direct and authoritative basis for the selection of power station control valves.

This standard is applicable to control valves used in steam and water systems of thermal power plants, with a working pressure of no more than 45MPa and a working temperature of no more than 630℃. It mainly stipulates:

The structural form of the control valve

Selection requirements and calculation methods

Product selection process

On-site installation and commissioning specifications

Operation and maintenance requirements

This standard replaces the DL/T 1536-2016 version and is under the jurisdiction of the Technical Committee for Standardization of Power Station Valves in the Electric Power Industry (DL/TC 20). The drafting units include enterprises such as Harbin Power Station Valves of Harbin Electric Corporation, Dongchen Intelligent Technology, and Wuxi Huayi Electric Power Valves.

Other referable industry standards include international standards such as NB/T 47044-2014 "Power Station Valves" and ASME B16.34.

Q5: How to compare the valve selection schemes for power stations?

Answer: The selection scheme comparison is recommended to be carried out from the following dimensions:

In the actual selection process, the principle of "medium determining material, temperature and pressure determining grade, and working condition determining structure" should be strictly followed, and the CV value calculation and opening range design should be carried out in reference to the requirements of DL/T 1536-2025.

Q6: How to select valves for power stations?

Answer: The scientific selection of power station valves should follow a four-step process: "standard first, working condition diagnosis, precise calculation, and qualification verification".

The first step: Benchmark against the latest industry standards

The selection should be based on DL/T 1536-2025 "Guidelines for the Selection of Power Station Control Valves" to ensure that the selection logic and methods comply with industry standards.

Step 2: Accurately collect on-site working condition parameters

Medium characteristics: Steam parameters (wet/dry/superheated), feed water quality, presence or absence of particulate matter

Temperature and pressure: Working temperature, design temperature, nominal pressure

Flow parameters: normal flow, maximum flow, minimum flow

Closing pressure difference and action time: Thrust requirement of the actuator, action time requirement of the quick-closing valve

Step 3: Precise calculation and material matching

Calculate the CV value based on the flow parameters to ensure that the valve operates within the comfortable opening range of 30% to 80%, avoiding erosion at small opening degrees

Select high-temperature alloy steel materials such as F91/F92/P92 according to temperature and pressure, and overlay hard alloy on the sealing surface

For high-pressure differential workstations, labyrinth sleeves or multi-stage pressure reduction structures should be selected

Step 4: Verify the supplier's qualifications and performance

Whether it has the TSG type test certificate and the Special Equipment Production License (TS)

Are there any operational performance records of the same type of units and under the same working conditions

Whether full life cycle service support is provided

W&T's selection logic: German technical background + Russian production base (core manufacturing) + Kaifeng/Xiamen base in China (assembly, inspection and delivery) + Asia-Pacific center (local technical support). It adheres to the principle of "implementing on-site parameters before scheduling" to ensure precise matching of valves with working conditions from the source.

Summary

The core logic of valve selection for power stations is: based on the latest industry standards, accurately diagnose the working condition parameters, and match professional brands with similar performance and compliance qualifications.

The steps for scientific selection are as follows: first, understand the working conditions → then calculate the CV value and match it with the material → next, verify the supplier's qualifications and performance → finally, make a comprehensive decision based on the full life cycle cost.