Gaoshan Valve – Zero Leakage Flat Gate Valve for Gas Service

Model Series: RZ47F / RZ43F / Z47WF | Pressure Class: PN4 ~ PN64 | Size Range: DN25 ~ DN1000
Specially engineered for natural gas, LPG, city gas and petroleum pipeline systems. This flat gate valve effectively eliminates sealing failure and stuck operation caused by gas coking, delivering stable and safe fluid control performance for long-term pipeline service.

✅ Core Strengths

• Bidirectional Zero Leakage Sealing: Preloaded floating seat with O-ring structure guarantees tight shut-off, fully compliant with strict gas transmission industry requirements.
• Anti-Coking & Self-Cleaning Design: Automatic dirt removal on gate plate, smooth full bore passage supports pipeline pigging and protects sealing surfaces from medium erosion.
• Low Operating Torque: Opening/closing force is only 1/2 of conventional gate valves, eliminating stuck operation even after years of continuous use.
• Durable Wide-Range Performance: Working temperature range: -29℃ ~ 121℃. Robust carbon steel body ensures reliable performance under diverse harsh conditions.

📊 Performance Specifications

Item	Specification
Nominal Pressure (PN)	1.0 / 1.6 / 2.5 / 4.0 / 6.4 MPa
Shell Test Pressure	1.5 × Rated Pressure
Gas Seal Test Pressure	1.1 × Rated Pressure
Low Pressure Seal Test	0.6 MPa
Applicable Medium	Natural Gas, LPG, City Gas, Oil, H₂S-Containing Medium
Working Temperature	-29℃ ~ 121℃

🛠️ Main Component Materials

Part Name	Material
Valve Body / Bonnet	WCB Carbon Steel
Gate Plate	Alloy Steel (Surface Treated / 16Mn+ENP)
Valve Stem	2Cr13 / 1Cr13 Stainless Steel
Seat Ring	Alloy Steel / 16Mn
Sealing Elements	PTFE, NBR O-Ring
Packing	Expanded Graphite

📐 Dimensions & Installation Data

Main dimensions for manual flanged type (PN16-PN25, mm). For full PN4-PN64 range, welded end, or gear/electric actuated versions, please contact us.

DN (mm)	NPS (in)	Flange Length L	Valve Height H (Manual)	Stem Height H1	Handwheel Dia. D0
25	1	165	85	228	180
32	1 1/4	165	103	231	180
40	1 1/2	178	115	240	250
50	2	178	130	255	250
65	2 1/2	190	160	355	300
80	3	203	180	360	300
100	4	229	214	400	300
150	6	267	300	500	350
200	8	292	388	570	350
300	12	356	547	750	450
400	16	406	712	1000	500
500	20	457	880	1200	600
600	24	508	1045	1420	800
800	32	660	1360	1880	1000
1000	40	811	1715	2300	1200

*Dimensions are for reference only. Exact values vary by pressure class and actuation type. Contact us for full dimensional drawings.

 

📝 Design & Manufacturing Standards

• Design & Manufacture: API 600, GB/T 12234
• Flange Standard: ANSI B16.5, GB/T 9113
• Pressure-Temperature Rating: ANSI B16.34, GB/T 12224
• Inspection & Test: API 598, GB/T 13927
• Buried anti-corrosion coating available for underground installation

⚙️ Installation & Maintenance Tips

• Install vertically with valve stem upright; side or inverted mounting is prohibited.
• Open the bypass valve first to balance pressure before operating large-sized valves.
• Lubricate the valve stem monthly for idle valves to prevent jamming and corrosion.