Question 1

What is a cast steel gate valve and what is it used for?

Accepted Answer

A cast steel gate valve is an industrial valve used to isolate or shut off flow in a pipeline. SHIELD Cast Steel Gate Valve Series CSGA is engineered for power plants, oil & gas, marine and general industrial services, with API 600 certification, bolted bonnet and pressure seal designs, and pressure ratings from Class 150 to Class 2500.

Question 2

What is the difference between bolted bonnet and pressure seal gate valve?

Accepted Answer

Bolted bonnet gate valves use a bolted joint between the body and bonnet and are ideal for general industrial service up to Class 600/900. Pressure seal bonnet valves use a self-energizing seal that becomes tighter as internal pressure rises, making them suited for high-pressure applications from Class 900 to Class 2500 in power generation.

Question 3

What pressure classes and sizes are available?

Accepted Answer

SHIELD Cast Steel Gate Valves are available from Class 150 to Class 2500, with sizes from DN50 to DN1500 (2" to 60"), and end connections in flanged, butt welded and socket welded configurations.

Question 4

What is an OS&Y gate valve?

Accepted Answer

OS&Y stands for Outside Screw and Yoke. The stem and yoke are outside the valve body, so the valve position (open or closed) is visible at a glance. OS&Y design is common in cast steel gate valves used in critical isolation service.

Question 5

What is the difference between a flexible wedge and a solid wedge gate valve?

Accepted Answer

A flexible wedge has a small groove around its perimeter that allows it to flex and compensate for seat surface distortion or body deformation caused by piping stress. A solid wedge is a rigid one-piece wedge used for simpler, less thermally dynamic service.

Question 6

What are the leading cast steel gate valve standards?

Accepted Answer

SHIELD Cast Steel Gate Valves are designed and tested according to API 600, API 602, ASME B16.34, and API 598 / ISO 5208 for pressure testing, with flange drilling per ASME B16.5 and ASME B16.47.

Question 7

铸钢闸阀有什么特点？

Accepted Answer

SHIELD 铸钢闸阀系列 CSGA 符合 API 600 标准，提供螺栓阀盖和压力自密封设计，配 OS&Y 明杆支架式或暗杆配置，柔性或实心楔板，压力等级 Class 150 至 Class 2500，适用于发电、石油天然气、船舶及一般工业隔离工况。

Question 8

铸钢闸阀的工作温度范围是多少？

Accepted Answer

SHIELD 铸钢闸阀适用温度范围为 -29°C 至 425°C，配合司太立 6 号硬面阀座和可更换密封焊结构，可在高温高压管线中提供长期可靠的密封。