Coliter ® Stainless Steel Soft Seal Groove Gate Valve – PN16, 0–80°C, Zero-Leakage for Water Systems
Z81X Stainless Steel Soft Seal Groove Gate Valve – Full-Port, Debris-Resistant Gate Valve with EPDM Sealing
The Coliter® Z81X Stainless Steel Soft Seal Groove Gate Valve is a high-performance gate valve designed for reliable, bubble-tight shut-off in water supply, HVAC, fire protection, and municipal piping systems. Constructed entirely from CF8 (304) stainless steel for the body, bonnet, and disc—with an SS304 stem—it offers excellent corrosion resistance and long service life. The valve features a flat-bottom groove design that prevents accumulation of cement, sand, or debris during pipeline flushing, ensuring smooth closure and zero leakage. Its soft sealing system utilizes a resilient EPDM or NBR elastomer wedge that compresses against precision-machined seats for tight shut-off even after extended use. Rated at PN16 (1.6 MPa) and suitable for temperatures up to 80°C, the Z81X complies with GB/T 12238, GB/T 12221, and GB/T 13927-89 standards. Available in sizes from DN50 to DN300 with groove-end connections, it supports full-port flow with minimal pressure drop—ideal for building mains, pump stations, and irrigation networks demanding maintenance-free, leak-proof isolation.
Installation diagram
Product Description
| DN | PIPE DIA O | L | L | H | H1 | W | |
| F5 | SABS | ||||||
| 50 | 63 | 250 | 335 | 77 | 300 | 340 | 180 |
| 65 | 75 | 270 | 335 | 80 | 310 | 350 | 180 |
| 80 | 90 | 280 | 335 | 84 | 350 | 390 | 200 |
| 100 | 110 | 300 | 355 | 88 | 380 | 420 | 220 |
| 125 | 125 | 325 | 375 | 91 | 420 | 460 | 220 |
| 125 | 140 | 325 | 375 | 91 | 420 | 460 | 220 |
| 150 | 160 | 350 | 405 | 94 | 470 | 510 | 250 |
| 200 | 200 | 400 | 450 | 100 | 590 | 630 | 280 |
| 200 | 225 | 400 | 450 | 100 | 590 | 630 | 280 |
| 250 | 250 | 450 | 450 | 125 | 680 | 720 | 320 |
| 300 | 315 | 500 | 500 | 140 | 790 | 830 | 360 |
Generally, gate valves often accumulate foreign objects such as cement blocks and iron debris in the bottom groove of the valve J after flushing the pipe with water, which can easily cause water leakage due to inability to close tightly. The bottom of the elastic seat seal gate valve adopts the same flat bottom design as the pipeline, which is not easy to cause debris accumulation and allows the fluid to flow unobstructed.
Due to the use of three "O" ring sealing designs between the valve stem and valve cover, the friction resistance during switching can be reduced, water leakage can be greatly reduced, and the sealing ring can be replaced without stopping the flow of medium in the pipeline.
Executive standard
| Design standards | GB/T12238 |
| Structure length standard | GB/T12221 |
| Inspection and testing | GB/T13927-89 |
Materials of main parts
| Name | Material |
| Valve body | CF8 |
| Valve plate | CF8 |
| Stem Nut | CF8 |
| valve stem | SS304 |
| Bonnet | CF8 |
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Faq - Frequent questions
Introduction to Soft sealing gate valve
Coliter®’s soft sealing gate valves deliver bubble-tight shut-off in water supply, HVAC, and municipal pipelines with zero leakage and low torque operation. The series includes the Z41X rising stem type, Z45X non-rising stem type, compact Z15X threaded-end model, and secure DZ45X/DZ15X lockable variants—all featuring a resilient rubber or EPDM wedge that seals against a precision-machined brass or ductile iron seat. Rated at PN16 (1.6 MPa) and suitable for temperatures up to 80°C, these valves comply with GB/T 12234 and offer full-port flow with minimal pressure drop. Ideal for building mains, pump stations, and irrigation networks where reliable isolation and long service life are critical.
