Industrial piping · isolation duty
Specify what the valve must isolate, where trapped pressure can go, and which dimensions must fit. The nominal pipe size answers only one of those questions.
Industrial metal ball valves for line isolation. Neway’s published designs provide the component and dimensional examples below; each example retains its own material, size and operating conditions.
01
The stem turns a bored ball through a quarter-turn. Aligning the bore with the pipe opens the passage; turning it across the line closes it against the seats. In a floating design the ball can move slightly toward the downstream seat under line pressure. A trunnion design supports the ball and uses moving seats to establish the seal. Neway’s sectional drawings show these different load paths. [1] [2]
| Arrangement in Neway’s trunnion catalogue | Response to cavity pressure | Selection consequence |
|---|---|---|
| Self-relieving seats · SPE | When cavity pressure overcomes the opposing seat forces, the seat can move away from the ball and relieve toward the pipeline. | Identify the permitted relief destination and pressures on both sides of the closed valve. [2] |
| Double-piston seats · DPE | Cavity pressure can energize the seat seal rather than open a relief path. | Neway calls for automatic cavity relief unless otherwise agreed. Ask for the actual relief arrangement, not just a DIB-1 label. [2] |
| One SPE seat and one DPE seat | The catalogue describes cavity relief through the SPE side. | The seat orientation becomes part of the purchase specification and installation drawing. This is its DIB-2 option. [2] |
These are the manufacturer’s illustrated arrangements, not a guarantee attached to every “trunnion” listing. A DBB description also needs the selected seat configuration and test basis. Do not infer a safe maintenance isolation procedure from the product name. [2]
02
This functional BOM follows the Neway BA reduced-port valve, catalogue pp. 12–13, using the carbon-steel, non-sour material column. Numbers below are drawing positions, not quantities. It is a named reference assembly; a different series, sour-service build or supplier needs its own controlled BOM. [1]
| Component · drawing position | Function in the assembly | Material in this BA column |
|---|---|---|
| Body and body insert · 1, 2 | Enclose the ball and seats; the insert closes the body opening. | ASTM A216 WCB for both. |
| Ball · 3 | Rotates the flow passage and contacts the seats. | ASTM A182 F6a. |
| Seats · 6 | Provide the sealing contact around the ball. | PTFE. |
| Stem · 7; thrust washer · 11 | Transmit handle rotation and support the stem at its bearing interface. | Stem: ASTM A182 F6a; washer: PTFE. |
| Gland flange · 5; gland · 8 | Load the stem-packing assembly. | Flange: ASTM A216 WCB; gland: ASTM A276 304L. |
| Body gasket · 9; stem packing · 10 | Seal different leak paths: the body joint and stem exit. | Flexible graphite gasket; graphite packing. |
| Gland screws · 12 | Secure the gland-flange assembly shown in the drawing. | ASTM A193 B7. |
| Anti-static device · 13 | Provides the conductive path described between the internal valve parts and body. | The table says stainless steel without a specific grade. |
| Handle, stops and retaining hardware · 4, 14–16, 18–23 | Operate, limit and retain the manual mechanism. | Carbon steel in this column except position 15, which is listed as stainless steel. |
| Optional O-ring · 17 | An additional seal shown around the body-insert area. | Viton A in this column; optional does not mean supplied on every valve. |
The same catalogue gives a different stainless-steel build: CF8M body/insert and F316 ball/stem. Do not assemble a material declaration by taking preferred entries from different columns. Where a certificate or exact compound is required, put the selected positions and materials into the order. [1]
03
Both examples below are the BA reduced-port NPS 2 × 1½ (DN 50 × 40) entry on catalogue p. 14. The flow bore d remains 38 mm, while the flange-to-flange dimension L and listed weight change. The pressure-class number alone does not establish interchangeability. [1]
Compare columns side by side. On a narrow screen, scroll the table horizontally.
| BA catalogue entry | Bore d | Length L | Weight |
|---|---|---|---|
| Class 150 | 38 mm | 178 mm | 8.7 kg |
| Class 300 | 38 mm | 216 mm | 11.0 kg |
The Class 300 entry is 38 mm longer in this comparison. Record the existing face-to-face space, flange standard/class, facing, bolt pattern, gasket and support arrangement. These two catalogue rows are not a substitute for the approved connection drawing. [1]
Neway’s separate engineering table lists Cv 423 for its 2-inch full-bore Class 150 entry and Cv 133 for the 2 × 1½-inch reduced-bore entry. Those are flow coefficients from the catalogue, not promised operating flows and not two BA configurations. Ask for flow data tied to the quoted model and check it against the actual fluid and permitted pressure drop. [1]
04
Neway plots seat-material pressure–temperature limits separately from body-class curves. A body rating does not establish the suitability of its seats, packing and other seals at the proposed duty. Obtain the complete selected valve’s written limits, including conditions during operation. [1]
| Item on the valve schedule | Evidence to require | Why it matters |
|---|---|---|
| Process and upset duty | Fluid composition, solids, normal/design pressure and temperature, differential pressure in each direction, and any trapped-liquid condition. | A family’s widest catalogue temperature and pressure ranges do not prove those extremes are available together. |
| Body, ball, seats and seals | The selected material column or itemized BOM, with corrosion/service suitability accepted for the stated fluid. | The BA PTFE seat example does not authorize substituting PEEK, RPTFE or an elastomer without reviewing the complete build. [1] |
| Pressure designation and ends | Specify the applicable PN or Class designation and the exact end-connection drawing. | ISO 17292 lists several classes and PN designations within its scope. That list is not a conversion table equating PN16–40 with Class150–600. [3] |
| Shell and closure acceptance | Agreed test standard/edition, medium, pressure, duration, leakage criterion and test record for the supplied valve. | ISO 5208 addresses pressure-boundary and closure testing. Its public abstract does not provide the paid acceptance tables. [5] |
| Control-valve leakage terminology | If a control-valve leakage class is specified, name its standard and test conditions explicitly. | FCI’s own explanation addresses control-valve seat tightness under defined tests. It does not support relabelling an isolation valve’s leakage as a percentage under “ISO 5208 Class VI”. [6] |
| Fire or emissions evidence | If required, request the applicable test/certificate and its coverage of the quoted construction. | A catalogue feature description or an API/ISO number alone is not verified evidence for the particular valve being purchased. |
Only the public ISO scope pages were read for this guide. Detailed test values, certification coverage and project acceptance remain contractual checks; no universal leakage percentage is asserted here.
05
ISO 5211:2026 covers the mounting flange and drive connection of part-turn actuators, including reference interface torque values. It does not specify the pipe ends or establish the operating torque of your selected valve in your process. [4]
Neway’s floating-valve table gives 40 N·m for its 2-inch Class 150 reference. The note uses ambient temperature and RPTFE seats for that class. This cannot simply be assigned to the PTFE BA material example above. Fluid and trim changes require a fresh selection. [1]
Applying Neway’s stated reference factor of 1.3–1.5 to 40 N·m gives 52–60 N·m. This arithmetic illustrates its actuator-selection note; it is not an approved actuator rating for a specific installation. Ask the supplier to match the required valve torque through the stroke to the actuator output at the minimum available supply, including the required failure action. [1]
06
The BA drawing has a removable body insert; Vihung separately offers fully welded trunnion valves. These are different constructions with different access questions. Ask what can be replaced on the installed model and what requires valve removal. Neither catalogue is the service procedure for a different supplier’s valve. [1] [7]
Neway describes emergency sealant fittings on certain trunnion configurations. Their presence is not permission to inject sealant or dismantle a pressurized assembly; obtain the selected manufacturer’s procedure and the site’s isolation authorization. [2]
07
Paste it into your enquiry below or into an email to a maker, then replace every bracket.
Line / valve tag and isolation duty [ ] Fluid composition, solids and any special service [ ] Normal / design pressure and temperature; differential pressure in both directions [ ] Trapped-cavity condition; required seat arrangement and relief destination [ ] Nominal pipe size, required bore and flow / permitted pressure loss [ ] Pressure designation; end standard, facing, mating drawing and face-to-face space [ ] Body, ball, stem, seats, packing and other seal materials [ ] Manual or actuator; minimum supply; failure position; operating time and feedback [ ] Required valve torque and complete actuator selection / mounting drawing [ ] Agreed shell and closure test standard, conditions and acceptance record [ ] Required material traceability, fire / emissions evidence and its exact coverage [ ] Installed dimensions / mass, removal clearance, maintenance instructions and spare kits [ ]
These existing supplier records cover industrial line valves, actuator packages and sanitary tube assemblies. Read the specific offering before sending the same specification to every company.
Publishes floating and trunnion industrial ball-valve catalogues. The BA parts and dimensional examples above come from its floating-valve catalogue; request the specific series, seat arrangement and controlled order drawing. Published family features do not establish certificate coverage for a quoted valve.
Product scope checked 2026-10-10
Describes fully welded trunnion ball valves with full/reduced bores and self-relieving seats, plus optional DIB arrangements. Ask for the quoted seat configuration and cavity-relief drawing. Website approval lists were not independently verified.
Product scope checked 2026-10-10
Lists pneumatic floating, trunnion, metal-seated, soft-seated and V-port ball-valve arrangements. Treat the valve and actuator as a selected package: the page gives inconsistent switching-time claims, so obtain an agreed cycle time and torque selection for the actual duty.
Product scope checked 2026-10-10
Lists industrial ball valves, including DBB and segmented designs. Its homepage distinguishes the AFC group from Hefei AFC International Trade, described as the export company. Establish the legal seller, actual manufacturer and selected valve model before placing an order.
Product scope checked 2026-10-10
Publishes industrial floating and trunnion valves, including flanged, socket-weld and threaded listings; the catalogue also contains multiway and polymer designs. Match the individual entry to the line specification. Its broad category standards list is not a verified compliance record for every listed valve.
Product scope checked 2026-10-10
KAYSEN’s KS-BV02 listing concerns a three-piece sanitary ball valve. Its title, connection field and description mix welded and clamp-end wording; request a single agreed end drawing and pressure–temperature rating. This is a sanitary-tube enquiry, not evidence of the BA industrial design above.
Product scope checked 2026-10-10
Publishes a sanitary three-piece valve with PTFE seats, several seal options and clamp, weld or threaded ends. Specify the actual end family and seal set. The offered sanitary assembly is a different procurement scope from a flanged industrial isolation valve.
Product scope checked 2026-10-10
Publishes a three-piece clamp sanitary valve with 304/316L options and several seal materials. Its page describes on/off operation, but does not provide a complete pressure–temperature selection. General FDA, GMP and other certification wording on the page is not a verified certificate for the valve.
Product scope checked 2026-10-10
Lists three-piece clamp, tank-bottom, two-way and three-way sanitary ball-valve configurations. Its catalogue distinguishes encapsulated and non-encapsulated seat descriptions. Select the actual construction and cleaning duty; do not transfer specifications between those entries.
Product scope checked 2026-10-10
Offers sanitary three-piece and non-retention ball valves. The three-piece pressure figures are not mapped to size and end configuration; resolve that before comparing bids. Its Wenzhou company description and incomplete Hong Kong contact address also leave the production-site identity unresolved.
Product scope checked 2026-10-10
The legacy domain redirects to an ALLTO-branded site with a current ball-valve category, including a Q347F worm-wheel fixed-ball listing, one-piece and three-way valves. Request the selected model’s dimensional drawing, seat design and rated duty before comparing it with the catalogue examples above.
Product scope checked 2026-10-10
Explore company information and manufacturing capabilities, then discuss the scope of your project with a relevant supplier.
Not in the BA example reviewed here. The NPS 2 × 1½ entry has a 38 mm bore in both Class 150 and Class 300. Use the bore dimension and flow data for the selected model rather than treating the pipe designation as the opening diameter. [1]
Neway’s described DPE arrangement does not provide the SPE self-relieving path. Its catalogue requires automatic cavity relief unless otherwise agreed. The approved valve arrangement must resolve where excess cavity pressure will go. [2]
No. That entry belongs to Neway’s stated ambient-temperature and RPTFE-seat reference conditions. The actual model, trim, fluid, differential pressure and actuator supply must be included in the supplier’s selection. [1]
It defines the part-turn actuator attachment interface. The pipe connection and its pressure rating need their own specified standard and drawing. The current public entry reviewed is ISO 5211:2026. [4]
Sources checked 2026-10-10. Standards bodies and regulations define the requirements; manufacturer pages show published ranges for those models only. CNFX does not certify products or suppliers.
Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.
Compare manufacturer profiles with relevant product and process capability.