21 Sep,2026

Fire-tested valves are designed to limit external and through-seat leakage to the levels permitted by the applicable standard during and after a specified fire-test sequence. Widely used fire-test standards include API 607 for quarter-turn valves and valves equipped with nonmetallic seats, API 6FA for applicable API 6A and API 6D valves, and API 6FD for […]

20 Sep,2026

An API  600 gate valve is a bolted-bonnet cast-steel gate valve designed for petroleum and natural gas service where full-port openings, heavy wall sections, and large stem diameters are required. The applicable size and pressure-class range should be stated according to the edition of API 600 used for the project.  PANS Valve manufactures API 600 […]

19 Sep,2026

Valve sizing comes down to one number: Cv. Or Kv if you are working in metric. Selecting an appropriate Cv or Kv helps achieve the required capacity, but control performance across the operating range also depends on valve characteristics, rangeability, actuator and positioner performance, and the installed system. Get it wrong, and you end up […]

18 Sep,2026

Wedge, parallel-slide, forged, pressure-seal. Gate valve manufacturers in China cover all of it. API 600, API 602, API 6D, ASME B16.34. Full certification stacks across oil and gas, petrochemical, power, and water treatment. PANS Valve manufactures wedges: 2 to 72 in. Flat: 2 to 48 in., to API 600, API 6D, API 602, and API […]

17 Sep,2026

Quarter-turn. Compressed air. 90-degree disc rotation. That is how a pneumatic butterfly valve controls flow. Fast, automated, compact. Key selection factors are actuator type, seat material, body configuration, pressure class, and whether fail-safe is required. PANS Valve manufactures high-performance butterfly valves to ISO 9001, CE, API, and TUV standards for oil and gas, chemical, water […]

16 Sep,2026

Three valves. One assembly. That is what a block and bleed valve does. It combines isolation and pressure venting into a single compact unit, cutting down on weight, leak points, and installation complexity. A double block and bleed adds a second independent sealing surface, with a bleed port between the two seats to safely vent […]

15 Sep,2026

Industrial valve standards establish the design, material, dimensional, testing, and pressure-temperature requirements that manufacturers and buyers use to specify, procure, and install valves safely across oil and gas, chemical, power, and water treatment industries. One of the most widely referenced design standards is ASME B16.34, covering flanged, threaded, and welding-end valves across all pressure classes. […]

24 Aug,2026

Quick Answer: Check Valve Symbols in P&ID Diagrams Check valve P&ID symbols identify the valve type and permitted flow direction, with common variations for swing, lift, ball, spring-loaded, and double-door check valves. Standards such as ISA 5.1, ISO 10628/14617, BS EN 62424/DIN, and JIS define different graphical conventions for these symbols. Partnering with PANS Valve […]

10 Aug,2026

Quick Answer: Pressure Seal Valves for High-Pressure Applications Pressure seal valves use internal line pressure to strengthen the body-to-bonnet seal, making them ideal for high-temperature, high-pressure applications such as power generation, steam systems, and petrochemical processing. Their self-energizing design provides reliable sealing while reducing valve weight, maintenance requirements, and thermal stress compared with bolted-bonnet designs. […]