H44H Swing Check Valve

H44H Swing Check Valve

  • Product Model: H44H Series Swing Check Valve (H44H-16C/25/40/63/100)
  • Pressure Rating: PN16 ~ PN100 (1.6MPa ~ 10.0MPa)
  • Connection Type: Flanged connection
  • Main Material: WCB cast steel body
  • Sealing Type: Metal hard seal with alloy overlay
  • Working Medium: Water, steam, oil and weak corrosive fluid
  • Max Working Temperature: ≤425℃
  • Working Principle: Automatically open and close by medium pressure to prevent backflow
  • Installation Way: Suitable for horizontal pipeline mounting
  • Application: Petroleum, chemical industry, power plant and industrial water supply pipeline

Gaoshan Valve — H44H Flanged Swing Check Valve

Model: H44H-16C / H44H-25 / H44H-40 / H44H-63 / H44H-100  |  Pressure: PN16–PN100  |  Connection: Flanged  |  Medium: Water, Steam, Oil

Pressure Class
PN16 – PN100
DN Range
DN50–DN600
Body Material
WCB Cast Steel
Max. Temperature
≤425°C
Connection
Flanged
Design Standard
GB/T 12236

Water
Steam
Oil
Weak Corrosive Media

Core Strengths

Swing Disc Mechanism
Swing disc design with low pressure drop and minimal flow resistance. The disc opens fully at low flow velocity, reducing energy loss and pump load during normal operation.
Hard Alloy Sealing Surface
Valve disc and seat feature overlaid carbide hard alloy surfacing, providing excellent wear resistance, high-temperature durability, and reliable sealing under harsh operating conditions.
Wide Pressure Coverage
Available from PN16 to PN100 pressure classes, covering a broad range of industrial applications from low-pressure water systems to high-pressure petrochemical pipelines.
Large Size Range
DN50 up to DN600 available, making it ideal for main pipeline applications in power plants, water treatment facilities, and large-scale industrial systems.
Robust WCB Construction
All major components made from WCB cast steel with 45# steel shaft, ensuring superior strength, corrosion resistance, and long service life up to 425°C.
Quick-Closing Response
Disc closes rapidly when flow stops or reverses, effectively preventing water hammer and protecting downstream pumps, turbines, and equipment from reverse flow damage.

Product Overview

H44H flanged swing check valve is a widely used automatic non-return valve that prevents medium backflow through a swinging disc mechanism mounted on a hinge pin inside the valve body. When medium flows forward, the disc lifts open; when flow stops or reverses, the disc swings shut by gravity and backpressure—sealing tightly against the seat to block reverse flow. This valve is commonly installed at pump outlets, compressor discharge lines, and critical pipeline nodes in power plants, petroleum refineries, chemical plants, and water supply systems. Available in PN16 through PN100 classes with DN50 to DN600 sizes, it offers one of the most versatile check valve solutions for industrial applications.

Performance Specifications

ModelShell Test (MPa)Seal Test (MPa)Air Sealing TestApplicable MediumMax. Temperature
H44H-16C2.41.6—Water, Steam, Oil etc.≤425°C
H44H-253.82.5—
H44H-406.04.00.6 MPa
H44H-639.66.3—
H44H-10016.010.0—

Main Component Materials

Part NameMaterialPart NameMaterial
Body, Bonnet, RockerWCB Cast SteelValve Shaft45# Steel
Disc / Seat RingWCB Base + Overlaid Carbide Hard Alloy Surfacing

Main Dimensions & Weights

* Flange connection dimensions refer to P95 Flange Dimension Table.

PNDNL (mm)H (mm)Weight (kg)
PN165023016520
6529017525
8031019031
10035022541
12540024062
15048026583
200600365134
250730395197
300698435268
350787490325
400914520490
450978550590
500978570680
6001295600790
PN255023016524
6529017530
8031019037
10035022549
12540024074
15048028599
200600365160
250730395226
300711435308
350838490373
400864520563
450978550632
5001016570782
6001346600908
PN405023016529
6529017536
8031019045
10035022559
12540024089
150480285120
200600365193
250730395260
300711435354
350838490423
400864520648
450978550727
5001016570899
60013466001044
PN635030019034
6534020543
8038020554
10043023571
125500265107
150550295143
200650355242
250775405299
300900465407
3501025515451
4001150570745
PN1005030019242
6534020752
8038023565
10043026585
125500313128
150550360172
200650420277
250775480344
300900540468

* Dimensions are for reference only. Contact us for detailed drawings for your specific model.

Structure Drawing

H44H flanged swing check valve structure drawing showing disc, body, bonnet, hinge pin and flow direction arrow

Design & Manufacturing Standards

  • Design Standard: GB/T 12236
  • Face-to-Face Dimensions: GB/T 12221
  • Flange Standards: GB/T 9113, JB/T 79, HG/T 20596 (refer to P95 Flange Dimension Table)
  • Testing & Inspection: GB/T 13927, JB/T 9092
  • Applicable International Standards: API 594, EN 13709, EN 558 (optional)

Installation & Maintenance Guidelines

  • Installation Position: Install horizontally or vertically on horizontal pipelines only. Not suitable for vertical upward flow pipelines.
  • Flow Direction: Ensure the medium flow direction matches the arrow marked on the valve body. Incorrect installation will cause the valve to malfunction.
  • Pipeline Support: Do not allow the check valve to bear pipeline weight. Large-diameter valves require independent support brackets.
  • Maintenance: Regularly inspect the hinge pin, disc, and seat sealing surface for wear or corrosion to ensure reliable anti-backflow performance.

Application Fields

Power Generation Plants
Petroleum Refining
Chemical Industry
Water Supply Systems
Oil & Gas Pipeline
HVAC & District Heating
Marine Applications

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