Our stainless steel seated gate valve adopts precision‑ground SS304 / SS316 stainless steel seat & wedge rings for full metal‑to‑metal hard sealing. It is specially developed for corrosive working conditions where bronze‑seat gate valves suffer pitting corrosion. Two stem configurations are available: OS&Y (Outside Screw & Yoke / Rising Stem) and NRS (Non‑Rising Stem).

Manufactured conforming to AWWA C500, MSS SP‑70, EN 1171 and EN 558 standards. Size range covers ANSI 125LB 2"‑24" and European PN10 / PN16 DN50‑DN600. Valve body optional GG25 cast iron or GGG40 ductile iron. Widely used for coastal salt‑bearing water, chemical wastewater, steam and marine piping systems.

Core Advantages

SS304/SS316 Anti-Corrosion Sealing Surface

Chromium-nickel stainless steel resists chloride ion erosion and mild acid corrosion, avoiding pitting rust issues of bronze seats under saltwater environments. Stable bi-directional shutoff performance up to 232°C continuous working temperature.

Dual Structure for Different Installation

RS Type: Visible exposed stem for quick open/close identification, fit for above-ground pump stations and chemical plant piping.
NRS Type: Compact height with full anti-sand stuffing box, perfect for buried manhole and space-limited underground pipelines.

Customizable Material Matching

Standard SS420/316/304 stem, carbon steel bolts; SS304 bolts and bushings are optional for marine & chemical projects to prevent dissimilar metal corrosion. Ductile iron body offers stronger pressure and impact resistance for heavy-duty industrial lines.

Global Standard Flange & Strict Pressure Test

ANSI 125LB flanges follow ANSI B16.1, face-to-face dimension matches AWWA C500; PN10/PN16 flanges comply with EN 1092. Every valve passes shell and seat hydrostatic test before delivery.

Dimension Charts

ANSI 125LB Inch Size Chart

Size	L	D1	D2	D3	b	n-φd	D4
2"	178	51	121	152	15.9	4-φ19	178
2.5"	190.5	65	140	178	17.5	4-φ19	178
3"	203.2	80	152.5	190	19.1	4-φ19	200
4"	228.6	102	190.5	228.6	23.8	8-φ19	254
5"	254	127	215.9	254	23.8	8-φ22	300
6"	266.7	152	241.5	279	25.4	8-φ22	300
8"	292	203	298.5	343	28.6	8-φ22	348
10"	330	254	362	406	30.2	12-φ25	400
12"	355.6	305	432	483	31.8	12-φ25	457
14"	381	356	476	533	35	12-φ29	508
16"	406	406	540	597	36.6	16-φ29	558
18"	432	457	578	635	39.7	16-φ32	610
20"	457	508	635	699	42.9	20-φ32	640
24"	508	610	749	813	47.6	20-φ35	762

EN PN10 / PN16 DN Metric Size Chart

DN	L	D	D1	D2	D3	b	C	n-φd	D4
50	178	99	51	125	165	18	1.5	4-φ19	178
65	190	118	65	145	185	18	1.5	4-φ19	178
80	203	132	80	160	200	20	1.5	8-φ19	200
100	229	156	102	180	220	22	1.5	8-φ19	254
125	254	184	127	210	250	24	1.5	8-φ19	300
150	267	211	152	240	285	24	1.5	8-φ23	300
200	292	266	203	295	340	28	1.5	12-φ23	348
250	330	319	254	355	405	30	1.5	12-φ28	400
300	356	370	305	410	460	30	1.5	12-φ28	457
350	381	429	356	470	533	36	4	16-φ28	558
400	406	480	406	525	597	38	4	16-φ31	558
450	432	548	457	585	640	40	4	20-φ31	610
500	457	609	508	650	715	42	4	20-φ34	640
600	508	720	610	770	840	48	5	20-φ37	762

Parts Material List

NO.	Part Name	Material Choice	Standard Reference
1	Valve Body	GG25 Cast Iron / GGG40 Ductile Iron	GG25 / GGG40
2	Body Seat Ring	SS304 Stainless Steel	ASTM SS304/SS316
3	Wedge Seat Ring	SS304 Stainless Steel	ASTM SS304/SS316
4	Wedge Gate	GG25 / GGG40	GG25 / GGG40
5	Wedge Bushing	Cast Brass / SS304 Optional	ASTM B584 C86400
6	Stem	Stainless Steel	ASTM SS420/SS304/SS316
7	Bonnet Gasket	Flexible Graphite	Industrial Graphite
8	Bolts	Carbon Steel / SS304 Upgrade	ASTM A307 B
9	Nuts	Steel / SS304 Optional	ASTM A563
10	Bonnet	GG25 / GGG40	GG25 / GGG40
11	Stem Packing	High Temperature Graphite	Graphite Packing
13	Gland Follower	GGG40 Ductile Iron	ASTM A536 65-45-12
17	Handwheel	GG25 Cast Iron	GG25

Note: NRS type adds washer, stuffing box and stuffing box gasket; RS type removes stuffing box parts.

FAQ

What standards apply to your stainless steel seated gate valve?

Two main standard series: ‑ US standard: MSS SP‑70‑2011, AWWA C500‑2019, ANSI B16.10, ANSI B16.1 Class125. ‑ European standard: EN 1171‑2015, EN 558‑2022 Series3, EN 1092‑2023 PN10 / PN16.

What pressure grades are available?

ANSI version: 125S / 200WOG, 150S / 250WOG.
EN PN10: Nominal 1.0 MPa, shell test 1.5 MPa, seat test 1.1 MPa.
EN PN16: Nominal 1.6 MPa, shell test 2.4 MPa, seat test 1.76 MPa.

What media and temperature can stainless‑steel‑seated gate valve handle?

Suitable for chloride‑containing raw water, marine water, wastewater, steam, light‑corrosive oil and gas. Max continuous working temperature ≤232°C.

What material for the stainless‑steel seat ring?

Seat ring and wedge‑ring adopt SS304 as standard; SS316 is optional upgrade for higher anti‑corrosion requirement. Valve body GG25 cast iron or GGG40 ductile iron.

Can I get both OS&Y and NRS type stainless‑steel‑seated gate valve?

Yes. We produce both OS&Y rising‑stem and NRS non‑rising‑stem versions, for above‑ground or buried‑pipe installation. NRS model comes with complete anti‑sand stuffing‑box assembly.

What size range is covered?

Sizes from DN50 (2") up to DN600 (24"), including ANSI inch‑size and EN DN metric‑size.

What is the difference between stainless‑steel‑seated and bronze‑seated gate valve?

Stainless‑steel‑seated trim performs much better for salt‑water and chloride‑rich corrosive media; bronze seat is more cost‑effective for neutral clean‑water, oil‑gas service but risks pitting corrosion under chloride environment. Both belong to metal‑hard‑sealing and allow minor permissible leakage.