05-Oct-2026

In chemical processing, water treatment, marine, and general industrial applications, selecting the right valve for corrosive media requires more than choosing a corrosion-resistant body material. Long-term valve reliability also depends on whether the ball or disc, stem, seats, O-rings, gaskets, and other wetted parts are compatible with the actual process media. At Anson Flow, we evaluate media type, concentration, temperature, pressure, and operating conditions to help customers select suitable valve materials, seat materials, and sealing configurations. 1. Common Valve Body Materials for Corrosive Media Different chemicals can affect metals in very different ways, so valve body material should always be selected based on the actual service conditions. Valve Body Material Key Characteristics Typical Applications 316 / 316L Stainless Steel Good general corrosion resistance Chemical processing, water treatment, general industrial fluids Duplex Stainless Steel Improved resistance to chlorides and pitting Seawater, marine, chloride-containing environments Super Duplex Higher resistance to pitting and crevice corrosion Offshore, marine, and severe corrosive service Hastelloy Excellent resistance to many aggressive chemicals Chemical and specialty process applications Titanium Excellent resistance to seawater and certain chloride environments Marine and specialty chemical applications PFA Lined Good resistance to many acids, alkalis, and chemicals Corrosive chemical service There is no single material that is suitable for every corrosive fluid. For example, 316 stainless steel performs well in many general applications, but more severe chloride or chemical environments may require Duplex, Super Duplex, Hastelloy, or another specialty material. 2. Seat and Seal Materials Matter Too Even if the valve body material is suitable, incompatible seats or seals may still cause swelling, hardening, wear, leakage, or premature failure. Material Key Characteristics Selection Considerations PTFE Excellent chemical resistance and low friction Suitable for a wide range of general chemical media Reinforced PTFE Improved mechanical strength and wear resistance Suitable for higher pressure or frequent operation PEEK High mechanical strength, wear resistance, and higher temperature capability Suitable for high-temperature, high-pressure, or demanding service PFA Excellent chemical resistance Suitable for highly corrosive chemical environments Delrin (POM) High mechanical strength, dimensional stability, and good wear resistance Suitable where greater support or wear resistance is required; chemical compatibility must be confirmed Metal Seat Suitable for high temperature, high pressure, abrasive media, and severe service Often used in high-temperature or particle-containing applications EPDM Good resistance to certain acids, alkalis, and water-based media Compatibility should be confirmed for the actual process fluid FKM / Viton Good oil, chemical, and temperature resistance Common in chemical and oil & gas applications Delrin and metal seats are selected differently from conventional soft seats. Delrin is mainly valued for its mechanical strength, wear resistance, and dimensional stability, while metal seats are often selected for high-temperature, high-pressure, abrasive, or particle-containing service. Seat selection should therefore consider not only chemical compatibility, but also sealing requirements, operating torque, and overall process conditions. 3. What Should Be Confirmed Before Valve Selection? Before selecting a valve for corrosive service, the following conditions should be reviewed: Selection Factor Why It Matters Media Type Different chemicals affect metals, plastics, and elastomers differently Concentration Corrosion behavior can change significantly with concentration Temperature Higher temperatures may accelerate corrosion and affect seat performance Pressure Influences valve body, seat, and overall design selection Flow Velocity High velocity may increase erosion-corrosion and wear Solid Particles Can cause wear on seats and sealing surfaces Cleaning Media Steam, cleaning chemicals, or flushing media may also affect material life One important point is that the same chemical may behave very differently at different concentrations and temperatures. For this reason, general descriptions such as “acid,” “chemical liquid,” or “wastewater” are usually not enough for accurate valve material selection. Key Factors in Corrosive Media Valve Selection For corrosive applications, the following should be evaluated together: Media + Concentration + Temperature + Pressure + Valve Body Material + Wetted Parts + Seat + Seals + Valve Design A higher-grade or more expensive material is not always the best choice. The goal is to select the most suitable material combination and valve configuration for the actual operating conditions. 4. Need Help Selecting the Right Valve? Anson Flow offers a wide range of industrial valves, corrosion-resistant materials, seat options, and sealing configurations for chemical processing, water treatment, marine, oil & gas, and general industrial applications. If you are looking for a valve for corrosive media, please provide: Process media & concentration Operating temperature Operating pressure Valve size & connection Required valve type Special material or testing requirements Contact Anson Flow with your operating conditions. Our team can assist you in selecting the appropriate valve material, seat, and configuration for your application. sales@ansonflow.com

22-Sep-2026

In valve manufacturing, a thread may look like a small detail, but its accuracy can directly affect assembly, sealing performance, interchangeability, and installation on site. At Anson Flow, threaded connections are manufactured according to the applicable thread standards and customer requirements. From standard pipe threads to special or proprietary thread profiles, we focus not only on machining the thread, but also on verifying that the finished connection meets the required dimensions and fit. Manufacturing According to Different Thread Standards Different markets, piping systems, and applications may require different thread types. Depending on the valve design and customer specification, Anson Flow can manufacture threaded connections according to commonly used international standards, such as: ·         NPT / NPTF ·         BSPT ·         BSPP ·         Metric Threads ·         Other specified thread forms and dimensions Before production, our engineering team reviews the required thread type, size, pitch, tolerance and connection details to ensure that the machining requirements are clearly defined. Thread Inspection Is Part of the Manufacturing Process Producing a thread is only the first step. After machining, the thread must also be checked to confirm that it meets the specified requirement. Depending on the thread type and application, inspection may include: ·         Thread gauges ·         GO / NO-GO gauges ·         Dimensional inspection ·         Thread pitch verification ·         Fit-up inspection with mating components ·         Customer-specified inspection requirements This helps reduce potential problems during installation, such as improper engagement, incompatible connections or difficulty assembling the valve with existing piping or equipment. What If the Customer Uses a Special Thread? Not every project uses a standard connection. In replacement projects, OEM equipment, older machinery or specialized industrial systems, customers may encounter a thread that does not completely match a commonly available standard. In these situations, Anson Flow can provide customized thread machining based on the customer's actual requirements. Customers may provide: 1. Technical Drawings If a drawing is available, we can review the specified thread dimensions, pitch, tolerances and connection details and manufacture accordingly. 2. Physical Samples If no complete drawing is available, customers may also provide an existing sample. Our engineering team can evaluate the sample dimensions and connection characteristics and reproduce the required thread based on the actual component. This is particularly useful for replacement valves, OEM parts and discontinued or special equipment, where matching the existing connection can be more important than simply selecting a standard thread. From Standard Connections to Customized Solutions A threaded valve should not require the customer to redesign the entire piping system just because the connection is unusual. Whether your application requires a standard NPT or BSP connection, a specific metric thread, or a special thread based on an existing component, Anson Flow can evaluate the requirement and provide a suitable manufacturing solution. For special thread inquiries, customers are welcome to send us: ·         Thread type or applicable standard ·         Valve size and model ·         Technical drawing ·         Thread dimensions and pitch ·         Photos of the existing connection ·         Physical sample, if available Our engineering team will review the information before production and confirm the feasible manufacturing solution. Need a valve with a special threaded connection? Send us your drawing or existing sample, and our team will help evaluate the required thread and customization possibilities.

07-Sep-2026

Standard 3-way ball valves are widely used for flow diversion, distribution, and line switching. Anson Flow also offers a complete range of conventional L-Port and T-Port 3-way ball valves for general applications. However, when the application requires a different switching sequence, a Bottom Entry 3-Way Ball Valve with 180° operation can provide a more suitable solution. The Key Difference: 180° Operation One of the main features of the Bottom Entry design is its 180° operating range. The operating sequence can be arranged as: Side A Open → Both Side Ports Closed → Side B Open At the middle position, both side flow paths are shut off before the valve continues rotating to the opposite side. This means the valve does not simply switch directly from one line to another. Instead, it provides a clear shut-off position between the two flow directions. Standard 3-Way vs. Bottom Entry 3-Way Feature Standard 3-Way Ball Valve Bottom Entry 3-Way Ball Valve Port Arrangement Conventional 3-way arrangement Common port from the bottom Switching Function L-Port / T-Port flow switching 90° / 180° switching Intermediate Position Depends on ball configuration Both side ports can be closed Main Advantage Flexible multi-way flow control Shut off flow before switching to the opposite line Typical Use General process piping Applications requiring controlled line selection The biggest difference is therefore not only the bottom connection, but the operating sequence and intermediate shut-off position. Two Bottom Entry Solutions from Anson Flow For different system requirements, Anson Flow offers Bottom Entry 3-Way Ball Valves in both process and instrumentation configurations. AF-S2T 3-Way Bottom Entry Ball Valve Designed for general process piping applications, the AF-S2T provides: Bottom-entry configuration 90° / 180° operation Intermediate shut-off position 2-seat design PTFE / Delrin Seats L-Port / T-Port options ISO 5211 direct mounting It is suitable for applications such as tank selection, filter switching, pump selection, and process line diversion. AF-75 Instrumentation 3-Way Ball Valve For smaller-bore and higher-pressure applications, the AF-75 provides the Bottom Entry concept in a compact instrumentation design. Key features include: Size: 1/8"–1/2" 90° / 180° operation Pressure Rating: 3000 PSI 316 Stainless Steel PEEK Seat Threaded or Compression Connections Compact Bottom Entry design It is suitable for instrumentation tubing, sampling systems, pressure instruments, and compact high-pressure piping. Why Choose a Bottom Entry Design? A Bottom Entry 3-Way Ball Valve can be useful when: The common line approaches from below Flow must be stopped before switching between two lines A clear intermediate shut-off position is required Piping space is limited Controlled line selection is important For conventional diversion or distribution duties, Anson Flow also provides a full range of standard 3-way ball valves. Explore Anson Flow Multi-Way Valve Solutions Looking for the right 3-way or multi-way valve for your application? Explore Anson Flow’s Multi-Way Valve range for standard, Bottom Entry, and instrumentation solutions designed for different flow paths, pressures, and piping requirements. View Multi-Way Valve Solutions:https://www.ansonflow.com/product-category/multi-way-valve For product selection, quotation, or technical support, please contact us: Email: sales@ansonflow.com Send us your required size, pressure, connection, and flow diagram, and our team can help you select the most suitable valve configuration.

24-Aug-2026

When reviewing a ball valve drawing or the actual valve itself, you may notice a small hole drilled into the ball. This feature is often generally referred to as a vent hole, relief hole, or pressure equalizing hole. However, not every hole serves the same function. In ball valve design, two commonly confused features are: ·         Pressure equalizing hole at the top of the ball ·         Upstream relief hole used for one-way sealing / cavity pressure relief Although both are related to pressure management, their purpose, pressure path, and effect on flow direction are quite different. 1. Pressure Equalizing Hole at the Top of the Ball The first type is a small hole located near the top of the ball, typically close to the stem slot. Its main purpose is to connect the ball port with the valve body cavity, allowing pressure around the ball to equalize more easily. This design can help: ·         Equalize pressure around the ball ·         Reduce unnecessary differential pressure across the ball ·         Minimize mechanical load caused by pressure imbalance However, there is an important point to understand: A pressure equalizing hole does not necessarily provide complete cavity pressure relief. When the valve is fully closed, depending on the ball geometry and hole location, this passage may not directly relieve trapped body cavity pressure back into the pipeline. Therefore, if the application has a significant risk of trapped cavity pressure, a dedicated relief design may still be required. 2. Upstream Relief Hole for Cavity Pressure Relief Another common design is a relief hole drilled through one side of the ball. When the valve is in the closed position, this hole is intentionally oriented toward the designated upstream side. If the fluid trapped inside the valve body cavity expands due to temperature increase, vaporization, or thermal expansion, the cavity pressure can then be released back toward the upstream pipeline. This design is commonly considered for applications such as: ·         Cryogenic service ·         LNG ·         Liquid nitrogen ·         Volatile fluids ·         Liquids with significant thermal expansion ·         Other special services where excessive cavity pressure must be avoided Compared with a top pressure equalizing hole, the function of an upstream relief hole is more direct: It creates a defined pressure relief path between the valve body cavity and the designated upstream side. Why Does This Design Make the Valve Unidirectional? This is one of the most important differences between the two designs. When the relief hole is drilled on only one side of the ball, that side must be installed toward the designated upstream direction. When the valve is closed, trapped cavity pressure must be relieved through this opening back to the upstream side. As a result, even if the standard valve design is capable of bidirectional shutoff, adding an upstream relief hole normally creates a defined flow direction and makes the valve effectively unidirectional. The flow direction marking on the valve body should therefore always be followed. Incorrect installation direction may not only prevent the intended cavity pressure relief function, but may also affect the sealing performance of the seat. Two Small Holes — Two Different Functions Design Main Function Typical Location Affects Flow Direction? Top Pressure Equalizing Hole Equalizes pressure between the ball and body cavity Top of ball / near stem slot Usually no Upstream Relief Hole Relieves trapped cavity pressure toward the designated upstream side Side of ball Yes, usually directional From the outside, both designs may appear to be nothing more than a small drilled hole. From an engineering perspective, however, they serve very different purposes. When Selecting a Ball Valve, Don’t Just Ask “Does It Have a Vent Hole?” For cryogenic, high-pressure, volatile, or thermally expanding media, the important question is not simply: “Is there a hole in the ball?” Instead, the valve design should be evaluated based on: ·         Is the hole for pressure equalization or cavity pressure relief? ·         Which side does the cavity pressure relieve to? ·         Does the valve require a specific installation direction? ·         Is the seat design bidirectional or unidirectional? ·         Is trapped cavity pressure possible under the actual operating conditions? These details can directly affect valve safety, sealing performance, and installation. Need Help Selecting the Right Pressure Relief Design? Anson Flow provides ball valve solutions for cryogenic, high-pressure, fire-safe, and special service applications. If you are unsure whether your application requires a top pressure equalizing hole, upstream vented ball, or another cavity relief design, send us your operating medium, pressure, temperature, valve size, and flow direction requirements. Our team can help evaluate the appropriate valve configuration for your application. Website:www.ansonflow.com Sales & Technical Inquiry:sales@ansonflow.com Talk to Anson Flow about your valve application today.

14-Aug-2026

When engineers specify a flanged valve, most of the attention goes to body material, pressure class, and trim. The flange face — the finished surface where the gasket actually seals — often gets treated as an afterthought. Yet it is exactly where a joint either leaks or holds. Pick a face that is wrong for the pressure, the temperature, or the mating flange, and you end up with either a leak path or money spent on capability you will never use. Here are the three flange facings you will actually meet in the field, and where each one belongs. Raised Face (RF) — the default workhorse The RF is the most common facing in process piping. A small raised surface — 1.6 mm (1/16") on Class 150 and 300, 6.4 mm (1/4") on Class 400 and above — concentrates the bolt load onto a defined gasket area. It works with flat ring or spiral-wound gaskets and covers the vast majority of general service from Class 150 to 2500. Use it for: general water, oil, gas, steam, and process service at moderate pressure and temperature — the sensible default unless something specific pushes you off it. Flat Face (FF) — for cast iron and low pressure An FF flange mates across its whole face with a full-face gasket. Its main job is to protect brittle mating flanges: bolting a raised face against a cast-iron flange can crack it as the studs pull the raised faces together, so equipment like cast-iron pumps and low-pressure vessels is specified FF. Use it for: connections to cast-iron or bronze equipment, and low-pressure Class 125/150 utility service. Ring-Type Joint (RTJ) — high pressure, high temperature, critical service An RTJ has a machined groove that seats a solid metal ring gasket (oval or octagonal). Made up by the bolt load, the ring deforms into the groove to form a metal-to-metal seal — the most leak-tight facing in common use, and the standard choice where failure is not an option. For the highest-pressure and wellhead duty, pressure-energized RX and BX rings take the same principle further. Use it for: Class 900, 1500, and 2500; high-temperature service; and critical hydrocarbon duty — wellheads, high-pressure gas, refinery hot lines. How to Choose — the Short Version Facing Typical class Seal Best for FF 125 / 150 Full-face gasket Cast-iron equipment, low pressure RF 150 – 2500 Flat / spiral-wound gasket General process — the default RTJ 900 – 2500 Metal ring, metal-to-metal High P/T, critical hydrocarbon Two rules of thumb tie it together: as pressure and temperature climb, you move FF → RF → RTJ; and always match the mating flange — the same face, the same finish, and for RTJ the same ring number. Don't Forget the Surface Finish Even a correct RF leaks if its finish is wrong for the gasket. RF faces carry a defined serrated finish — commonly 125–250 µin AARH (Ra ≈ 3.2–6.3 µm) — that gives a spiral-wound or sheet gasket something to bite into. Too smooth and the gasket slips; too rough and it will not seal. It is a small spec that quietly decides whether the joint holds. Anson Flow Flanged Valves Anson Flow supplies flanged gate, globe, ball, and check valves with RF or RTJ facings to ASME B16.5 / B16.47, dimensioned and rated to ASME B16.34 (and API 6D where applicable) — so the valve's face, class, and finish match the flange it bolts to. Tell us your class, service, and the mating flange facing, and our engineering team will confirm the right face and finish for the joint. 📩 sales@ansonflow.com 🌐 https://www.ansonflow.com

07-Aug-2026

Every gate and globe valve has to solve one quiet but critical problem: how to seal the joint between the body and the bonnet — the pressure boundary that also has to open back up whenever the valve needs service. How that joint is made determines the valve's pressure capability, its maintainability, and how safely it holds over years of thermal cycling. There are several ways to close a bonnet — screwed, union, welded, pressure-seal — but for the vast majority of industrial gate and globe valves, one design has become the default: the bolted bonnet. Here is why it earns that position. 1. Built to Be Serviced, Not Scrapped The internals of a gate or globe valve are wear parts — the gate's wedge and seats, the globe's disc and seat, and the stem and packing common to both. Over a long service life they need inspection, re-machining, or replacement. A bolted bonnet makes that routine. Undo the bonnet bolts and the entire trim is accessible: lap the seats, replace the wedge or disc, renew the stem or packing, and re-torque. Compare that with a welded bonnet, which seals permanently but turns any internal wear into a scrap-the-valve event. This matters even more on globe valves, which are frequently used for throttling and repeated operation — duties that wear the disc and seat faster and make easy access essential. Over the life of a plant, a serviceable valve is almost always the lower total cost, and the bolted bonnet is what makes service possible. 2. High Pressure and Temperature, Held Predictably The bolted joint is a studded, gasketed pressure boundary. Bolt preload clamps the bonnet to the body across a defined gasket, and that clamp load is what contains the line pressure — not thread engagement, and not an operator's feel on a wrench. Because the load is set by torqued studs, it is predictable, inspectable, and repeatable. That is what lets bolted-bonnet gate and globe valves cover the full industrial range — from ANSI Class 150 up to Class 2500 — and ride out the repeated thermal cycling of steam, process, and pipeline service without loosening. 3. A Defined, Replaceable Seal The body-bonnet joint seals on a discrete gasket chosen for the duty: sheet gaskets at lower classes, spiral-wound or ring-joint metallic gaskets at higher pressures. This matters because the sealing element is a known, specified, replaceable part — not an assumption. When the bonnet is opened for service, the gasket is simply renewed, and the joint returns to a defined sealing condition every time. Screwed and union bonnets cannot offer the same combination of high-pressure integrity and clean re-sealing. 4. Standardized, Certified, and Easy to Specify The bolted bonnet is the joint the governing standards are written around. Cast-steel gate valves are built to API 600 and forged-steel to API 602; steel globe valves to B16.34 — all with pressure-temperature ratings to ASME B16.34 and shell/seat testing to API 598. For a buyer or engineer, that means a bolted-bonnet gate or globe valve is interchangeable, inspectable, and globally accepted — you specify a class and a standard, and you know exactly what you are getting. It is the path of least risk in procurement. 5. A Platform for Variants Because the bolted bonnet is a modular, bolted structure, it adapts cleanly to demanding service. The clearest example is cryogenic duty: an extended bolted bonnet moves the stem packing away from the cold zone, keeping the seal warm and workable. Both gate and globe valves take the same variant — it simply bolts onto the proven architecture. The AnsonFlow Gate & Globe Valve Range Model Type & Design Range AF-GTE Gate · cast steel · bolted bonnet · API 600 ANSI 150–2500 · PN10–40 · JIS 10K/20K · 1/2"–36" AF-GTF Gate · forged steel · bolted bonnet · API 602 ANSI 150–1500 · 1/2"–2" AF-GTC Gate · cryogenic · extended bolted bonnet 1/4"–3" AF-GVE Globe · cast steel · bolted bonnet · B16.34 ANSI 150–900 · PN10–40 · JIS 10K/20K · 1/2"–12" AF-GVF Globe · forged steel · bolted bonnet · API 602 / BS 5352 ANSI 150–2500 · 1/2"–2" AF-GVC Globe · cryogenic · extended bolted bonnet ANSI 150/300 · JIS 10K/20K · 1/2"–6" All are built to the bolted-bonnet standards that make gate and globe valves serviceable, certifiable, and reliable across oil and gas, petrochemical, power, and process service. Tell us your class, size, material, and service conditions, and our engineering team will help you specify the right configuration. 📩 sales@ansonflow.com 🌐 https://www.ansonflow.com/product-category/check-globe-gate-n