KINGNA TRADING

Engineering & Selection Hub

Valves, Slurry Pumps & Wear Parts Engineering Guide

Interactive cross-section diagrams, 50Hz/60Hz pump affinity calculator, and material selection standards for Middle East, Egypt & Central Asia projects.

Waterworks & Industrial Valves: How to Pick the Right Type

Recommended: Resilient-seated gate valve (EN 1074 / BS 5163)
Soft-seated wedge: bubble-tight, full bore, low head loss when fully open. Confirm EN 558 face-to-face and EN 1092 flanges.
Service / duty Recommended type Why
Potable water main, isolationResilient-seated gate valve (EN 1074 / BS 5163)Bubble-tight soft seal, full bore, low head loss
Buried main, no surface accessGate valve with NRS stem + extension spindleCompact above-ground footprint, stem seal stays serviceable
Above-ground station, visible position neededOSY rising-stem gate valveStem travel shows open/closed at a glance
Large diameter, tight space, occasional throttlingButterfly valve (wafer / lugged / flanged)Low weight and short face-to-face at big DN
Pump discharge, backflow protectionSilent check (anti-water-hammer) or swing checkNon-slam closure protects the pump and the pipeline
Sewage / solids in suspensionBall-type or flap check valveNo seat pocket for solids to settle in
Pipeline high point, air pocketAir release valve, single or double orificeVents accumulated air, prevents air lock and surge
Protect meters / control valvesY-strainer, mesh selected for the mediumTraps debris upstream; check pressure drop
Reservoir level or pressure controlHydraulic control valve — 100X float / 200X reducing / 500X sustainingPilot-operated, no external power; function follows the pilot
Flow control — hold a set flow rateFlow control valve (400X)Holds a preset flow despite upstream pressure changes
Steam / high temperatureMetal-seated gate or globe valveSoft elastomer seats are limited by temperature
Slurry / abrasive solidsKnife gate valve with elastomer sleevesBlade shears through solids, flush bottom port
Cryogenic (LNG / LIN / ASU)Extended-bonnet cryogenic valve (BS 6364)Vapour column keeps packing above freezing

Materials of construction: what we quote and why

These are the grades behind every quotation on this page. Ask for the casting certificate and the mill certificate number with the order.

ItemStandard offerUpgrade / notes
Body & bonnetDuctile iron QT450-10 / GGG40 castingQT500-7 or better where the spec demands it; casting certificate with the lot
Wedge / discDuctile iron core, fully vulcanised EPDMMetal-seated (bronze or stainless seat ring) for slurry, higher temperature or hydrocarbons
StemStainless 2Cr13Brass or SS304 on request; NRS extension spindle for buried mains
Seat / sealEPDM, potable-water gradeNBR for general industrial service; ask for the drinking-water statement if the line is potable
Strainer screenStainless steel 304Mesh selected against the medium; check the pressure drop
CoatingFusion-bonded epoxy, 250 um minimum, inside and outBuried service: FBE, or zinc-rich primer plus bitumen topcoat. Undocumented paint is a 3-year burial life instead of 15
Cryogenic valvesAustenitic stainless body, ASTM A351 CF8M / CF3MExtended bonnet to BS 6364; cold-box or non-cold-box design
Resilient-Seated Gate · Butterfly · Check · Air Release · Strainer · Hydraulic Control

Resilient-Seated Gate Valve (NRS)

DN40–DN600 · PN10 / PN16 · EN 1074 · BS 5163
Handwheel, non-rising stem Bolted bonnet joint Bonnet and gland Wedge shown open, clear of the flow Seat face, flush (pocketless) Ductile iron body Flanged ends Full-bore DN100 PN16, face-to-face 300 mm, overall height 458 mm (body and bonnet 343 mm) Resilient EPDM wedge, full-bore passage, epoxy-coated ductile iron body

Wafer Butterfly Valve

DN100 (4") · PN10 / PN16 · D71X
Lever handle Shaft through the disc Disc, shown part open Elastomer seat Wafer body, 56 mm thick Long clamp bolts Pipe flange, by others Body bore equals pipe ID DN100 PN16 wafer butterfly valve, 56 mm face-to-face (ISO 5752-20) Clamped between two pipe flanges by long bolts; no extra gaskets needed Elastomer seat, disc on a through shaft, lever handle; disc stays in the flow path

Swing Check Valve

DN50–DN400 · PN10 / PN16 · DIN F6-H44T
Heavy bolted cover Cover flange and gasket Hinge pin in cast lugs Plug seals the pin end Disc closed on the seat Seat ring Cast body, integral flanges Stud bolts Mating pipe DN100 PN16 flanged swing check valve, face-to-face 350 mm (EN 558 series 1) Cover 175 mm above the bore axis; hinge pin in cast lugs with screw plugs Seat ring inclined 10 deg; disc shown closed, forward flow swings it open

Combination Air Valve (CARX)

DN50–DN200 · PN10 / PN16 · high-point mounting
Rain cover on pillars Annular screen Small orifice nozzle Large orifice seat Bonnet with O ring Spherical float Perforated guide barrel Rubber buffer pad Barrel body, flanged base Inlet flange DN100 To pipeline below DN100 PN16 combination air valve: body 156 mm dia., overall height 395 mm Large orifice vents bulk air; the small nozzle (about 2 mm) releases air continuously Float rises with water to seal the large orifice; perforated barrel keeps it aligned

Y-Strainer

GL41H / DIN F1 · DN15 – DN400 · flanged / threaded
The screen mouth faces upstream inside the main bore: water enters the screen, passes through the mesh and leaves downstream. Dirt stays inside the screen — that is why the blow-down plug sits at its blind end.
/ Inlet flange DN100 Body, integral flanges Outlet to pipeline Perforated screen basket Y branch, 45 deg Debris collects inside Screen closed end Bolted cap with O ring Drain plug, 1 inch DN100 PN16 Y-type strainer: full bore body, face-to-face 350 mm (DIN 3202 F1), branch end 233 mm below the pipe axis Screen: one-piece perforated stainless steel basket, 3 mm holes, about 40 percent free flow area Blue arrows: main flow. Orange: particles settle into the basket and leave through the drain plug Body and screen dimensions from public DN100 PN16 flanged strainer catalogues

Hydraulic Control Valve

100X–800X series · DN50–DN400 · pilot-set function
Function is set by the external pilot: 100X remote float control, 200X pressure reducing, 300X slow-shutoff check, 400X flow control, 500X pressure sustaining / relief.
Return spring Pilot loop (schematic) Strainer Needle Ball Tank Upstream tap feeds the loop; the float pilot admits or vents the cover chamber. Cover, upper chamber Diaphragm, EPDM Stem and disc holder Disc, rubber seated Seat, full port Ductile iron body, integral flanges Inlet flange DN100 DN100 PN16 100X remote float control valve: face-to-face 292 mm, height 255 mm, flange OD 220 mm, 8 holes 19 mm Line pressure lifts the disc; the pilot loop admits cover chamber pressure to close it as the tank fills The cover chamber, not the water line, drives the disc: a small pressure differential is needed to work Body and flange dimensions from published DN100 PN16 remote float control valve data
The Workhorse: Resilient-Seated Gate Valve For potable water mains the resilient-seated gate valve is the default choice: soft-seated wedge gives bubble-tight isolation with a full bore, and it is quoted against EN 1074 / BS 5163 / EN 1171 with EN 558 face-to-face and EN 1092 flanges. For high temperature or solids in suspension, switch to a metal-seated wedge or a knife gate valve.
Three Questions Before Replacing Existing Valves ① Face-to-face standard (EN 558 vs DIN 3202 / ISO 5752) — a mismatch means the valve cannot drop into the existing pipeline gap; ② flange drilling and rating (EN 1092 PN vs ASME B16.5 Class); ③ operation: OS&Y (outside screw and yoke) rising stem, NRS non-rising (buried / tight space), electric actuator, signal or lockable type.
Second Main Line: Hydraulic Control Valves 100X–800X Pilot-operated hydraulic control valves for pressure, level, flow and pump protection: the main valve is driven by line pressure, and on the 100X / 200X / 300X / 400X / 500X the function follows the hydraulic pilot — no external power. The 600X adds an electrical (solenoid) pilot for remote open/close, and the 800X holds a constant pressure differential across an HVAC supply/return. Range DN50 – DN400 · PN10 / PN16.
Diaphragm chamber Return spring Plug off seat (open) Needle valve (sets closing speed) Pilot valve function set here Sensing line (from the inlet) Ductile iron body Inlet low · outlet high across the seat (S-flow) Main valve is common — the pilot valve sets the function
Pilot-operated hydraulic control valve — the main valve is common to the 100X–800X family; the pilot valve sets the function (float, pressure reducing, flow control or pressure sustaining), and the needle valve sets the closing speed.
Model Function What it does on site Data sheet
100XRemote float controlHolds a set liquid level in tanks and reservoirs from a float in the tankRemote Float Control Valve (100X)
200XPressure reducingHolds a constant downstream pressure regardless of upstream fluctuation or demandPressure Reducing Valve (200X)
300XSlow-shutoff checkRegulates closing speed to suppress water hammer in pumping and high-rise systemsSlow-Shutoff Check Valve (300X)
400XFlow controlHolds a preset downstream flow despite changes in upstream pressureFlow Control Valve (400X)
500XPressure sustaining / reliefRelieves pressure above the pilot set point and sustains upstream pressurePressure Sustaining / Relief Valve (500X)
600XElectric control (solenoid pilot)Opens and closes remotely on an electrical signal — solenoid pilot on a hydraulic main valveElectric Control Valve (600X)
800XDifferential-pressure bypassMaintains a constant pressure differential across HVAC supply and returnDifferential Pressure Bypass Valve (800X)
Market / project Gate valve Face-to-face Flanges
Egypt / Jordan (water utilities)EN 1074 · BS 5163 · EN 1171EN 558EN 1092
Gulf (UAE, KSA, Qatar)EN / DIN practice, ASME on requestEN 558 · ISO 5752EN 1092 · ASME B16.5
German-led industrial projectsDIN 3352DIN 3202EN 1092
Refinery / process (steel valves)API 600ASME B16.10ASME B16.5 (body per ASME B16.34)
Butterfly & check (industrial)EN 593 (butterfly) · API 609ISO 5752 · API 594 (check)EN 1092 · ASME B16.5
Pressure test / acceptanceEN 12266 · API 598ISO 5208—
BS and DIN gate valves share one European dimensional system BS 5163 and DIN 3352 gate valves share one European dimensional system (EN 558 face-to-face, EN 1092 flanges), so face-to-face and flange dimensions interchange where DN, PN and the face-to-face series match. Always confirm the existing pipeline face-to-face and bolt circle before ordering.
Deeper reading on this line
Waterworks valves: the full selection guide · Resilient vs solid wedge gate valve · Butterfly vs gate valve · Valve body and trim materials · PN vs Class pressure ratings · Check valve types · Air valve selection · Y-strainer selection · Hydraulic control valves 100X–800X
Product ranges on this line: Resilient-seated gate valve (NRS) · Rising-stem gate valve (OSY) · DIN F4 gate valve · AWWA gate valve · Butterfly valve D71X / D341X · Swing check valve · Silent check valve · Ball / flap check valve · Combination air valve CARX · Y type strainer GL41H · Hydraulic control valves 100X-800X

Cryogenic Valves (−196 °C): Extended Bonnet & Cavity Relief Engineering

LNG (−162 °C) · Liquid Nitrogen (−196 °C) · Air Separation Units (ASU)
about -40 C about -80 C about -120 C above -20 C at the gland -162 C LNG service Packing gland Extended bonnetstainless neck, 250 mm Drip plate Frost on the cold side Stainless cold parts
  • Extended bonnet
    250 mm minimum neck for non-cold-box service (BS 6364) - keeps the gland seal out of the cold zone
  • Why the gland stays warm
    Packing must stay above -20 C; a short neck freezes the seal and the stem cannot move
  • Handwheel and yoke
    Fixed handwheel, outside-screw yoke - standard operator, no special cryogenic part
  • Face-to-face
    350 mm long pattern / 190 mm short pattern, DN100 PN16 (EN 558)
  • Flanges
    EN 1092-2: OD 220 mm, 8 x Ø19 mm, 20 mm thick
  • Overall height
    Approx. 550-610 mm depending on neck length and operator
  • Service range
    Down to -162 C (LNG) - frost and cold-box insulation shown on the body
  • Temperature
    Falls along the neck: about -162 C at the body, above -20 C at the gland
Deep Cryogenic Treatment (−196 °C Soaking) Austenitic stainless steel (CF8/CF8M) bodies and trim undergo liquid nitrogen immersion at −196 °C prior to final machining to eliminate martensitic phase transformation distortion.
Unidirectional Cavity Relief Orientation Cryogenic ball and gate valves with upstream relief holes are unidirectional. Fit the valve so the upstream relief hole faces the pressure side; follow the arrow on the body.
Cryogenic valve range
Cryogenic valve range (engineered to order)

Slurry Knife Gate Valves & Pumping Station Valve Packages

Slurry & Tailings Isolation vs. Clean Water Pumping Station Protection
Sand packs into the pockets; the wedge cannot seat or clear Result: valve jams open, leaks past, frequent shutdown Bevelled stainless blade shears solids; sleeves seal with no pocket Result: no dead pocket, full bore, fewer shutdowns DN100 PN16 wafer knife gate, MSS SP-81; flanges to EN 1092-2 (OD 220 mm, 8 holes 19 mm) Conventional wedge gate valve in slurry Seat pockets fill with sand and the wedge jams open Slurry knife gate valve Full bore sleeves, no cavity, blade shears solids
Clean Water Pump Discharge Package Split-Case Pump → Rubber Expansion Joint → 300X Slow-Closing / HC41X Silent Check Valve → Dismantling Joint → DIN F4/F5 Gate Valve + CARX Air Release Valve.
Slurry & Dredging Pump Discharge Package NJB Dredge Pump → Bi-directional Elastomer Sleeve Knife Gate Valve (or Pinch Valve) → Rubber-Lined Slurry Check Valve.

Heavy-Duty Dredging Pumps (NJB) & Split-Case Pumps (SN)

17 Verified Models · 50 Hz / 60 Hz Affinity Law Calculator · Belt & Diesel Skid Configurations
Model NJB-175 @ 1200 r/min: Flow = 200 m³/h | Head = 25.0 m | Estimated shaft power = 55.0 kW
Safe Duty Point: Achievable via belt pulley ratio, gearbox reduction, or impeller trim.
NJB Dredge & Mud Pump • Non-clog wide channel • Low speed 385–1200 r/min • Belt pulley or diesel skid • Not tied to grid frequency Wear-resistant wet end, low rotational speed 17 verified models · parameters in the table below SN Split-Case Double Suction Double suction (both ends) · axially split casing • Axial thrust largely balanced • Efficiency 85.7% (rated) • Horizontal split casing
Left: NJB dredge & mud pump — non-clog wide channel impeller, low speed (385–1200 r/min), belt pulley or diesel skid drive. Right: SN split-case double-suction pump — axially split casing, largely balanced axial thrust, 85.7% rated efficiency.

Units — flow: m³/h · head: m · speed: r/min · power: kW · inlet / outlet / impeller: mm · weight: kg

Model Flow Head Speed Power Inlet Outlet Impeller Weight
NJB-175 200 25 1200 55 175 175 330 290
NJB-200 650 30 1100 110 200 190 390 520
NJB-250 800 30 1100 160 226 220 390 590
NJB-300 1800 25 900 340 300 280 540 1330
NJB-350 2250 26 900 400 350 350 586 1550
NJB-400 2800 26 860 450 400 400 680 2600
NJB-450 3000 24 650 480 450 435 740 2700
NJB-500 3200 20 650 510 500 470 780 2900
NJB-550 3500 24 600 650 550 490 890 4200
NJB-600 4500 24 600 800 600 550 940 5500
NJB-225-200 800 35 1000 300 225 200 540 1530
NJB-250-200 900 35 1000 340 250 200 540 1530
NJB-275-250 1100 26 900 400 275 250 586 1490
NJB-400-350 3200 30 600 880 400 350 940 5860
NJB-500-500 3600 20 600 735 500 500 940 5500
NJB-700-600 6600 63 385 Shaft 1830 / Motor 2500 700 600 1560 18800
SN350-300-M/1260-BB1-F 1260 44 1450 Shaft 180 / Motor 220 (Efficiency 85.7%, NPSHr 4.7 m) — — — —

Mining Wear Parts: Austenitic Manganese Steel vs. High-Chrome White Iron

Jaw Plates · Cone Crusher Mantles & Concaves · Impact Blow Bars · Mill Liners
Mn13Cr2 / Mn18Cr2 Manganese Steel Work hardening (jaw & cone liners) Impact surface hardens ~500 HBW Tough austenitic core (~220 HBW) Resists cracking under impact Best for: jaw plates & cone liners High-Chromium White Cast Iron (20–27% Cr) Sliding abrasion resistance (blow bars & pump parts) M7C3 carbides in martensitic matrix Hardness HRC 58–62 Best for: blow bars, VSI & pump wet parts
Wear parts range on this line
Jaw plates · Cone crusher parts · Blow bars · Mill liners · Hammers · VSI rotor parts · High-chrome parts · Custom castings

Need a selection sheet or a firm quotation? Send us the duty point — flow, head, medium, voltage — and we will reply with a model and price.

Request a quotation  ·  sales@kingnatrading.com