H42H vertical lift check valve

H42H vertical lift check valve

  • Product Model: H42H Series Vertical Lift Check Valve (H42H-25Q / H42H-25)
  • Pressure Rating: PN25 (2.5MPa)
  • Connection Type: Flanged connection
  • Structure: Vertical lift type with spring-supported disc
  • Body Material: Ductile iron (H42H-25Q) / WCB cast steel (H42H-25)
  • Sealing Material: 2Cr13 stainless steel disc and seat
  • Applicable Media: Water, steam, oil products and weak corrosive fluids
  • Working Temperature: ≤300℃ (ductile iron) / ≤425℃ (cast steel)
  • Installation Options: Vertical (without spring) or horizontal (with spring) mounting
  • Core Function: Automatically prevents medium backflow to protect pumps, motors and pipelines
  • Application Scenarios: Petroleum, chemical, pharmaceutical, power, water treatment and industrial pipeline systems

Gaoshan Valve — H42H Vertical Lift Check Valve

Model: H42H-25Q / H42H-25  |  Pressure: PN25  |  Connection: Flanged  |  Installation: Vertical Pipeline  |  Medium: Water, Steam, Petroleum

Pressure Class
PN25
DN Range
DN40–DN200
Body Material
Ductile Iron / WCB
Max. Temperature
≤425°C (WCB)
Connection
Flanged
Design Standard
GB/T 12235

Water
Steam
Petroleum Products
Non-Corrosive Media

Core Strengths

Vertical Installation Design
Specifically engineered for vertical pipeline installation, the disc closes reliably by gravity without spring assistance, making it ideal for pump outlets on vertical discharge lines.
Lift Disc Mechanism
The disc lifts vertically along a guided stem when forward flow pressure acts on it, and drops shut the moment flow stops—ensuring immediate and positive closure against backflow.
2Cr13 Stainless Steel Sealing
Both disc and seat ring are made from 2Cr13 stainless steel, providing excellent wear and corrosion resistance for long-term reliable sealing in demanding service conditions.
Dual Material Options
Available in ductile iron body (H42H-25Q, ≤300°C) or WCB cast steel body (H42H-25, ≤425°C), allowing selection based on temperature and service environment requirements.
Simple & Low-Maintenance Structure
Compact internal construction with minimal moving parts. No springs or external actuators required—gravity-driven closure reduces wear and maintenance costs over the valve’s service life.
Reliable Pump Protection
Installed at vertical pump discharge lines to prevent reverse flow when the pump stops, protecting pump impellers, seals, and pipeline equipment from water hammer and reverse rotation damage.

Product Overview

H42H vertical lift check valve is an automatic non-return valve designed for installation on vertical pipelines where medium flows upward. The valve disc moves vertically along a guided stem—lifting open when forward flow pressure exceeds the disc weight, and dropping closed by gravity when flow stops or reverses. This gravity-driven mechanism ensures reliable and immediate closure without the need for springs or external actuators. The H42H-25Q model uses a ductile iron body suitable for temperatures up to 300°C, while the H42H-25 model uses WCB cast steel for service up to 425°C. Both models feature 2Cr13 stainless steel disc and seat ring for durable sealing performance. Widely used at vertical pump discharge connections in water supply, power generation, petrochemical, and HVAC systems.

Performance Specifications

ParameterH42H-25QH42H-25
Nominal Pressure PN (MPa)2.5
Shell Test Pressure (MPa)3.8
Seal Test Pressure (MPa)2.8
Max. Working Temperature≤300°C≤425°C
Applicable MediumWater, Steam, Petroleum, etc.
Installation OrientationVertical pipelines only (upward flow)

Main Component Materials

ModelValve Body / BonnetDisc / Seat Ring
H42H-25QDuctile Cast Iron2Cr13 Stainless Steel
H42H-25WCB Cast Steel2Cr13 Stainless Steel

Main Dimensions & Weights

PressureDN (mm)Face-to-Face L (mm)Weight (kg)
PN25402009.5
5023014
6529017
8031026
10035037
12540060
15048090
200495150

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

Structure Drawing

H42H-25Q H42H-25 vertical lift check valve structure drawing showing flanged body, guided disc stem, seat ring and vertical flow direction

Design & Manufacturing Standards

  • Design Standard: GB/T 12235
  • Face-to-Face Dimensions: GB/T 12221
  • Flange Standards: GB/T 9113, JB/T 79, HG/T 20596
  • Testing & Inspection: GB/T 13927, JB/T 9092
  • Applicable International Standards: EN 13709, EN 558 (optional)

Installation & Maintenance Guidelines

  • Vertical Installation Only: H42H must be installed on vertical pipelines with upward medium flow. Do NOT install on horizontal lines — the disc will not function correctly without the gravity-assisted closure mechanism.
  • Flow Direction: Ensure the medium flows upward through the valve, matching the direction arrow on the valve body. Reverse installation will cause valve failure.
  • Pipeline Support: Do not let the valve bear pipeline weight. Large-diameter valves (DN150 and above) require independent support brackets to prevent flange stress.
  • Maintenance: Periodically inspect the disc, guided stem, and seat ring for wear or sediment buildup. Clean and replace sealing surfaces as needed to maintain reliable anti-backflow performance.

Application Fields

Pump Discharge Lines
Water Supply Systems
Power Generation Plants
Petrochemical Industry
HVAC & Heating Systems
Oil & Gas Pipelines

Get a Quote & Technical Support

Contact Gaoshan Valve today for detailed dimension sheets, CAD drawings, and customized solutions for your vertical pipeline system.

Request a Quote