Featured article Valve selection
Industrial Valve Selection Guide and RFQ Checklist
Compare industrial valve families, ZGV ball valve configurations and supplier documents. Download an editable RFQ checklist to compare quotations.
ZGV / The journal
Valve insights.
Selection guides, design comparisons and procurement notes, grounded in published product data.
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Valve selection
01Industrial Valve Selection Guide and RFQ Checklist
Compare industrial valve families, ZGV ball valve configurations and supplier documents. Download an editable RFQ checklist to compare quotations.
Read articleValve design
18
Full Bore vs Reduced Bore Ball Valves
Compare full and reduced bore ball valves using published ZGV dimensions, calculated passage areas and the flow data needed for a sound procurement decision.
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Soft Seated or Metal Seated Ball Valves
Choose a ball valve seat by fluid, particles, thermal cycling and shutoff duty. Compare ZGV seat compounds and the supporting seals and springs that change too.
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Concentric, Double Offset and Triple Offset Butterfly Valves
Separate butterfly valve offset geometry, seat construction and body connection. Compare ZGV materials, wafer and lug dimensions, and the duty behind the choice.
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Gate Valve vs Globe Valve for Isolation and Flow Regulation
Compare gate and globe valves by duty, RF length and open height. Use published ZGV dimensions to identify replacement-space problems before approving an order.
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Choosing a Check Valve for Pump Discharge
Assess pump discharge check valves by minimum flow, orientation and closing response. Compare ZGV catalogue geometry and a clearly bounded surge example.
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Bellows Sealed Valves for Stem Leakage Control
Understand what a bellows seal addresses, how it differs from seat shutoff, and what buyers need to check about materials, travel, cycles and maintenance space.
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Lubricated, Sleeved and Lift Plug Valves
Compare plug valves by sealing mechanism, operating sequence and maintenance evidence. Review ZGV lift-plug dimensions and the port map needed for multiport duty.
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API 6D vs API 608 Ball Valves: Specify the Right Standard
Compare API 6D and API 608 ball valves by scope, bore, isolation and order evidence. Build a clearer specification for a B2B manufacturer enquiry.
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Pressure Seal vs Bolted Bonnet Valves: Compare the Duty
Compare pressure-seal and bolted-bonnet valve joints for pressure, thermal cycling and maintenance. Define the bonnet requirements for your valve enquiry.
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Dual-Plate vs Swing Check Valves: Fit, Flow and Closure
Compare dual-plate and swing check valves by installation space, flow range and dynamic closure. Identify the data needed before selecting a replacement.
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Top-Entry vs Three-Piece Ball Valves: Plan the Repair
Compare top-entry and three-piece ball valves by repair access, piping interfaces and maintenance scope. Specify the drawings needed before ordering.
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Triple-Offset Butterfly vs Metal-Seated Ball Valves
Compare triple-offset butterfly and metal-seated ball valves by passage, leakage requirements, cycling and service conditions before requesting a quote.
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Slab vs Expanding Gate Valves: Sealing, Bore and Relief
Compare slab and expanding gate valves through their actual sealing mechanism, pigging passage and cavity-pressure arrangements for pipeline enquiries.
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DBB vs DIB Ball Valves: Ask for the Seat Pressure Cases
Compare DBB and DIB requirements using seat pressure directions, cavity relief and test evidence. Request a configuration-specific ball valve quotation.
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Low-Temperature vs Cryogenic Valves: What Buyers Must Verify
Specify cold-service valves with pressure-temperature cases, sealing direction, cavity relief and qualification evidence. Review the complete offered assembly.
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Can a Check Valve Be Installed Vertically? A Flow-Direction Guide
Choose check valves for vertical-up or vertical-down flow. Review the exact mechanism, opening pressure, minimum stable flow and movement clearance.
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Three-Way Plug Valves: Specify Every Port State and Transition
Define three-way plug valve ports, endpoint isolation and transition behaviour. Match the passage drawing, operator positions and acceptance requirements.
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Floating vs Trunnion Ball Valve: Design and Selection Guide
Compare floating and trunnion ball valve designs, seat behaviour, torque and pressure ratings. Use a practical checklist to specify a ZGV ball valve.
Read articleSpecification and testing
21
Class 150 Does Not Mean 150 psi
Class 150 is not a 150 psi operating limit. Learn to read material-specific pressure-temperature tables and avoid unsupported PN-to-Class substitutions.
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Valve Inspection and Leakage Testing for Procurement
Review valve shell, seat and external-leakage evidence, including hydrostatic and gas tests. Define the conditions and records for procurement acceptance.
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Sour-Service Valves: Specify NACE MR0175 / ISO 15156
Specify sour-service valves with the right H2S environment, material condition and component records. Understand the scope of NACE MR0175 / ISO 15156.
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Duplex Valve Materials in Chloride Service: Beyond PREN
Review duplex valve materials for chloride service using temperature, crevices, product form and inspection evidence. Understand what PREN can and cannot show.
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ASME B16.10 Valve Retrofits: Verify the Entire Interface
Plan valve replacements using ASME B16.10, the correct dimensional pattern, end connections and field checks. Avoid assuming a nominal-size match will fit.
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Cast vs Forged Steel Valves: Specify Material and Inspection
Compare cast and forged steel valves by product form, material requirements and inspection scope. Avoid assuming that manufacturing route guarantees quality.
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Valve Packing Live Loading: Check Load, Travel and Friction
Review valve packing live loading through spring load, available travel, temperature and stem friction. Specify an engineered assembly for thermal cycling.
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Low-Emission Valves: API 622, 624, 641 and ISO 15848 Explained
Distinguish API 622 packing, API 624 and API 641 valve type tests, and ISO 15848 evidence. Match external-leakage requirements to the offered build.
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Valve Material Certificates: Follow the Heat Number to the Part
Understand EN 10204 3.1 and 3.2 valve material certificates, heat-number traceability, component mapping and the records needed at receiving inspection.
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Cavitation vs Flashing in Valves: The Data Behind the Diagnosis
Distinguish valve cavitation and flashing using fluid properties and pressure recovery. Prepare operating-point data before selecting a replacement or trim.
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Fire-Safe Valve Certificates: How to Check the Offered Design
Check a fire-safe valve certificate against the offered design, seats, size and class. Separate valve qualification from powered-actuator requirements.
Read articleWCB vs CF8M Valve Bodies: Build a Complete Material Specification
Compare WCB carbon-steel and CF8M stainless valve bodies, then verify trim, seals, cleaning exposure and the complete offered material schedule.
Read articleTrapped Liquid in Ball Valves: Cavity Pressure Relief Questions
Review trapped liquid, temperature change and cavity relief paths in ball valves. Identify discharge direction, protection scope and supplier responsibilities.
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PMI vs NDE for Valves: Which Inspection Answers Your Question?
Define valve PMI and NDE by component, method, coverage and acceptance. Understand XRF carbon limits and the separate roles of surface and pressure testing.
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RF vs RTJ Valve Flanges: A Replacement Connection Checklist
Check RF and RTJ valve connections, gaskets, facing, bolting and installation length. Verify the actual mating joint before approving a replacement.
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Lug Butterfly Valves at End of Line: What Needs Approval?
Specify lug butterfly valve end-of-line duty with retained pressure, direction, hardware and support. Obtain approval for the exact removed-flange condition.
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Steam Isolation Valves: Specify Warm-Up, Drainage and Shutdown
Specify steam isolation valves for start-up, running and shutdown. Connect material, shutoff and operator requirements with condensate drainage and site duty.
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Y-Strainer Selection: Mesh, Open Area and Differential Pressure
Select Y-strainers by actual aperture, wire geometry, clean and dirty pressure loss, element strength and maintenance access, with a worked mesh example.
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Valve Pressure Loss and Pumping Energy: A Worked Buyer Example
Calculate a conditional valve energy comparison from flow, pressure-drop difference, efficiency and duty hours. Separate assumptions from measured savings.
Read articleCompare Valve Quotations with a Deviation Register
Compare valve quotations with the original requirement, offered scope and deviations in view. Resolve material, operator, document and delivery assumptions.
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Valve Receiving Inspection and Storage: Preserve the Approved Build
Carry valve identity, approved build and preservation from delivery to installation. Record condition, document gaps, storage checks and handover status.
Read articleValve automation
03
Valve Actuator Sizing at Minimum Air Supply
Check actuator output at minimum supply and mechanical limits at maximum supply. Review spring return, failure action and the assembled valve package.
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Fail Open or Fail Closed? Write a Valve Cause-and-Effect Matrix
Specify valve failure action for air, power and signal loss. Define energy, movement, feedback and restart requirements for the complete automated package.
Read articleElectric Valve Actuators: On/Off vs Modulating Duty
Compare electric valve actuator duties using movement frequency, running time, load and control requirements. Review the complete valve and drive package.
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For your next enquiry
One brief. Comparable quotations.
Record the service conditions, materials, dimensions and inspection requirements in one editable workbook.
Engineering library
Engineering records: plug and check valve designs
Two original design disclosures, with source-linked questions for the engineering team.
