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EG Valve Manufacturing Co., Ltd

Name: EG Valve Manufacturing Co., Ltd
Address: Sanqiao Industrial Zone, Oubei Town, Wenzhou, 325100, CN
Telephone: +86-577-57992227

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Welcome to EG Valves • Top China Valve Manufacturer for Gate Valve, Ball Valve, Butterfly Valve, Globe Valve, Check Valve & Strainers. Better Flow Supplier

EG Valve Manufacturing Co., Ltd is a professional valve manufacturer specializing in R & D, manufacturing and exporting industrial control valves. We offer consumers a wide range of valve products include Gate valve, Globe valve, Ball valve, Butterfly valve, Check valve and Strainer, which have been widely exported to US, Europe and worldwide. Our valves are manufactured according to ANSI, API, DIN, BS and JIS standards and the customers' requirements. All of them are made under ISO 9001:2000 certified processes. We have also got the approval of API-6D, CE, and CQC certifications. With over 15 years’ efforts, we obtain a good reputation depending on high-quality products and satisfactory services. Now every year over 10 million dollars worth of goods are delivered to every corner of the world. To supply a perfect product also means supply perfect service of strict quality control, favorable production leadtime and precise documentations. We have big investment in many factories, thus we have built up a very strong throughput, so whether the price is going down or up, we are always the one who can offer customers reasonable price and the best quality together. For more information about our valves and our services, contact us today.

15/10/2026

Need a CSV410 Check Valve? The Specs to Confirm First

Specifying a check valve for a new project usually comes down to four things: line size, pressure class, body style, and the medium inside.

Here's where the CSV410 check valve from EG Valves sits on each. Sizes run from 1/2" to 48". Pressure classes run from Class 150 to Class 1500. Body style is your choice: wafer, lug, or double fl**ge. And if the medium is oxygen or chlorine, the valve can be supplied with special cleaning for that service.

One more spec worth asking about: the quick-close Inconel spring.

These are hard to change after the valve is built, which is why they're worth confirming before the order goes to production.

Send us your line size, pressure class, and medium, and we'll come back with the configuration. EG Valves has been manufacturing industrial valves since 2000.

13/10/2026

BOV303 Triple Offset Butterfly Valve: Six Inquiry Details

BOV303 triple offset butterfly valve: a short product guide for buyers preparing an inquiry.

The BOV303 is built for shut-off duty in oil and petroleum, chemical, steel, and shipbuilding service. It covers sizes from NPS 2 to 60, pressure ratings PN10, PN16, PN25 and PN40 as well as Class 150, 300 and 600, and wafer, lug or double fl**ge connections.

Body and trim are available in carbon steel, stainless steel, alloy steel or duplex steel, with an optional Stellite seat for abrasive or high-temperature media. Operation can be handle lever, gearbox, worm gear, electric or pneumatic.

The triple offset geometry is why the seat lasts: the sealing surfaces meet only in the final degrees of closing, so the disc does not slide across the seat. That is what holds bubble-tight closure through repeated cycling instead of wearing the seal.

Six details make an inquiry faster:
- Service and media
- Size (NPS)
- Pressure class
- Body, disc and seat material
- Actuation
- Connection type

EG Valves inspects 100% of every valve and issues an EN 10204 3.1 material test certificate with each order. MOQ is 1 piece for large-size valves and 10 pieces for small-size valves; typical production lead time is 25–35 days, with monthly capacity of 8,000 valves.

11/10/2026

Water Treatment Lines: Matching the CSV410 Check Valve and SNI501 Strainer

On a water treatment line, two components are usually specified together: a check valve that stops backflow, and a strainer that keeps debris out of everything downstream.

For the check valve, EG Valves builds the CSV410 in stainless steel, duplex steel, and alloy steel. Wafer, lug, and double fl**ge bodies are available, along with dual plate, single plate, wafer lift, and threaded designs — NPS 1/2" to 48" (DN15–DN1200), Class 150 to Class 1500 (PN10–PN160). Seat faces are lapped for a smooth finish, the disc assembly is secured by a high-strength key, and high-torsion Inconel springs drive quick closing. Special cleaning is available for oxygen or chlorine service.

The SNI501 strainer handles the upstream side: cast iron or ductile iron body, Y-strainer or basket strainer construction, stainless steel screens in a wide variety of meshes and perforations, sizes NPS 2"–12" (DN50–DN300), Class 125/150 (PN10/PN16), with FF, RF, or threaded NPT/BSP/BSPT ends. The bolted-on cover keeps routine cleaning simple.

A useful sequence for buyers: fix the check valve style first, since pipe layout, size, and pressure class decide it — then match the strainer mesh to the pump and downstream equipment.

Working on a water treatment or HVAC project? Share your line conditions — medium, size, and pressure class — along with any questions on purchasing terms or acceptance criteria.

09/10/2026

Seal Wear: The Hidden Cause of Leakage After Frequent Cycling

Frequent cycling is one of the fastest ways to find out how a valve really seals. On many soft-seated butterfly valves, the disc presses on the seat each time it closes and drags across it on the way out. That contact slowly removes seat material, and the leak appears later — long after commissioning, not on day one.

The BOV303 triple offset butterfly valve from EG Valves is engineered around that mechanism. Its triple offset design eliminates wear associated with sealing surface contact, so the sealing faces are not rubbed through during the stroke. Where the medium is abrasive, an optional Stellite seat adds erosion resistance on the same sealing faces.

Size range NPS 2"–60" (DN50–DN1500), Class 150 / 300 / 600 and PN10 / PN16 / PN25 / PN40, in wafer, lug or double fl**ge bodies. Typical service includes oil and petroleum, refinery and tank farms, chemical plants, steel mills and shipbuilding — lines that keep cycling for years.

07/10/2026

Leaking at Shutoff? Maybe It's the Ball Valve Design

A drip at shutoff never looks serious at first. A small puddle under the valve, a pressure gauge that won't quite hold overnight. Then the line goes down at 2 a.m. and everyone starts asking who signed off on that valve.

Nine times out of ten it isn't the operator, and it isn't a lazy maintenance schedule. It's the ball valve geometry that never matched the duty.

Here's what actually happens. Every open-and-close cycle rubs the ball against its seat. On a floating ball design, line pressure pushes the ball downstream into the seat — that contact is the seal. It works great at low pressure and small bore sizes. But as pressure and size climb, that same force starts scuffing and squeezing the seat. Throw in thermal cycling plus a bit of abrasive carryover, and the sealing surface gives up long before the body does.

Three designs shrink that problem.

Trunnion-mounted. The ball is carried on trunnion bearings top and bottom instead of being shoved by line pressure. Seat load stays under control, so operating torque stays manageable as pressure and bore size increase. That's why trunnion ball valves show up on higher-pressure lines.

Top entry. Rather than cutting the whole valve out of the pipe, you unbolt the bonnet and lift the ball and seats out from above. On a line you can't easily drain, that can turn a full-day job into a couple of hours.

Fully welded. No bolted body joint to weep, no body fl**ges to leak. Usually the pick for buried runs or anywhere you'd rather not see that valve again for years.

EG Valves Manufacturing Co., Ltd is a valve manufacturer in Wenzhou, Zhejiang, China, founded in 2000, producing gate, globe, ball, butterfly and check valves plus strainers to ANSI, DIN, BS and JIS standards. When customers come to us with repeated leakage on critical shutoff duty, the two we usually put side by side are the Forged Steel Trunnion Ball Valve and the Fully Welded Ball Valve. Our ball valves are rated for an average cycle range of 70,000–100,000, built from DN6 up to DN1800 in carbon steel, stainless steel, alloys and lined options, with manual, pneumatic, electric or hydraulic operation. Factories hold API 600, API 6D, CE and PED certifications.

So the comparison usually comes down to three questions. How much pressure is the seat really seeing? Can you isolate the line for maintenance? And does the valve need to be serviceable while it's still bolted in place?

Which one is running on your lines right now — floating, trunnion, or fully welded? And what's your usual early warning that a seat is on its way out?

05/10/2026

Butterfly Valve Seal Wear: The China Triple Offset Answer

A butterfly valve that starts weeping at the seat a few months in usually isn't a bad valve. It's the wrong sealing geometry for the way the line is being run.

Here's the pattern. The valve cycles, the disc slides across the seat, the seat wears, and by the next shutdown window there's a drip in a line that's supposed to be shut tight. In oil and gas pipelines and chemical processing plants, where valves open and close all day, that wear comes back fast. Swapping the seat just buys another round of the same thing.

Triple offset geometry solves that specific problem. The three offsets make the disc lift off the seat before it turns, so the sealing surfaces only meet in the last few degrees of closing. No sliding. No scrubbing. The seat stays intact, and closure stays bubble-tight even after high cycle counts.

If you're comparing options before committing, this is what actually changes the outcome:

Seat material. Stainless steel with graphite is the standard choice and covers most media and temperature ranges. PTFE with a stainless steel backing is a common pick for chemical service. And if the media carries solids, the optional Stellite seat is worth asking about — it stands up to erosion where a standard seat face won't.

Body style. Wafer for tight fl**ge gaps, lug when one side of the line needs to be isolated for maintenance, double fl**ge for larger sizes and higher ratings.

Size and pressure class. The BOV303 triple offset butterfly valve covers NPS 2 to 60 (DN50 to DN1500), PN10 to PN40, and Class 150 to Class 600.

Body and disc material. Carbon steel, stainless steel, alloy steel, or duplex steel, matched to what's in the line.

Actuation. Lever and gearbox or worm gear for manual operation, electric or pneumatic for automated control.

One number that gets skipped in a lot of quotes: torque. EG Valves' BOV303 runs 20–40% lower opening and closing torque than most valves of the same size, which means a smaller actuator can do the job. Less air or power per stroke, less load on the stem, and a smaller line item when the actuator is part of the package.

EG Valves Manufacturing Co., Ltd is a valve manufacturer based in Wenzhou, China, producing gate, globe, ball, butterfly, check, and plug valves for oil and gas, chemical, power, and water applications.

So when a replacement is being weighed against a new valve, put seat life, torque, and actuator sizing side by side. Price on its own won't tell you which one is cheaper two years in.

What kills your seats faster — solids in the media, or plain cycle count?

03/10/2026

Knife Gate vs. Cast Steel Gate Valve: Two Core Differences

Two gate valves. Same family name. Completely different jobs.

Stand at the discharge of a mine tailings line and you'll usually find a Knife Gate Valve at work. Walk into a refinery unit moving high-pressure hydrocarbons and it'll be a Cast Steel Gate Valve. Both shut off flow. Put either one in the other's place and the line will tell you about it.

The first difference is how they close.

A Manual Knife Gate Valve uses a thin, sharp-edged disc that drops straight through the flow. It cuts through solids, fibers and settled grit instead of trying to push them out of the way. That's why it shows up in pulp & paper, mining, waste water, chemical and steel plants — anywhere the line is carrying something that isn't quite a fluid.

A Cast Steel Gate Valve works differently. Its flexible wedge presses against a machined seat ring, which holds tight on clean liquids and gases. In a slurry, grit packs into the wedge cavity and the seating faces stop meeting the way they should. The valve still looks fine. It just stops sealing.

Second difference: how much pressure the body can carry.

The Knife Gate Valve (model GTK022) is built for Class 125 & Class 150, PN6, PN10 and PN16, in sizes from NPS 2" to 48" (DN50–DN1200), with wafer, lugged or fl**ged ends. Not a high-pressure valve — and on a slurry line, it rarely needs to be.

The Cast Steel Gate Valve (model GTS019) is a different animal: OS&Y rising stem, flexible wedge, bolted or welded bonnet, body in carbon steel, stainless, alloy or duplex steel, rated Class 150 to Class 1500 and PN10 to PN160, from NPS 1-1/2" to 48". That's the class you see in oil & gas, refining, petrochemical and power generation. For tighter high-pressure spots, the Forged Steel Gate Valve (GTF023) goes from Class 800 up to Class 2500 in NPS 1/2" to 2-1/2".

We make both at EG Valves Manufacturing Co., Ltd, a valve manufacturer in Wenzhou, Zhejiang, China — gate, globe, ball, butterfly, check and plug valves, manual and actuated. Production runs under ISO 9001, with API 600, API 6D and CE/PED scope, and our valves have shipped to more than 33 countries. Both types sit in our Manual Valve range, so the pick is really about what's in the pipe.

Abrasive slurry, big bore, moderate pressure → knife gate. Clean fluid, high pressure, metal-to-metal tightness → cast steel. Gate valves as a category aren't getting smaller either; the global market was put at USD 13.0 billion in 2024 and is projected to reach USD 20.6 billion by 2034 (Market Research Future).

So what's actually in your line — and which one is on it right now?

01/10/2026

Triple Offset vs. Double Eccentric Butterfly Valves: Two Differences That Matter

Not every butterfly valve shuts off the same way. And when you're comparing quotes, that's usually the part worth slowing down on.

EG Valves Manufacturing Co., Ltd is a valve manufacturer based in Wenzhou, China, and two of the butterfly valves we build sit in the same catalog but not the same job: the triple offset BOV303 and the double eccentric BTV305. On a general arrangement drawing they look like relatives. Here are the two differences that actually decide which one goes on your line.

1. Seal surface contact, and the wear that comes with it

In a triple offset design, the seat and the seal stay apart through most of the stroke. Contact happens at the end of the close, not the whole way through it. Our BOV303 spec puts it plainly: the triple offset design eliminates wear associated with sealing surface contact. On a line that cycles all day, dosing or mixing or running through reaction steps, that's the difference between a sealing surface that lasts and one you're swapping out.

2. Bubble-tight closure, and how high it holds

The BOV303 is rated Class 150 / 300 / 600 (PN10–PN40) and covers NPS 2" up to 60". It closes bubble-tight, which is where the reduced maintenance and steadier process efficiency come from. Seat options are stainless steel + graphite or PTFE + stainless steel, plus an optional Stellite seat when erosion is the problem. Typical duty: refinery and tank farms, chemical plants, steel mills, shipbuilding.

For comparison, the double eccentric BTV305 is an existing part of our range. Its rating sits in a different band, Class 125 / Class 150 (PN6–PN16), NPS 8" to 48", with EPDM, NBR or FKM sealing. The design notes talk about minimal wear, a tilted disc that releases compression to extend durability, replaceable sealing materials, and a stainless steel shaft on self-lubricating bearings. Water treatment, HVAC, desalination, municipal supply, that's its home.

Neither one is a mistake. One holds bubble-tight at a higher pressure class without rubbing its seal to get there. The other has been doing general service work steadily for years. If you're sourcing butterfly valves from China, the pressure class and the cycle count are a far better filter than price per unit.

Every valve we ship gets 100% inspection and an EN 10204 3.1 material certificate, whichever design you pick.

So what tips it for you right now, the pressure class, how often the valve moves, or the medium running through it?

29/09/2026

Water Hammer Wrecking Your Line? Meet the CSV410

Two in the morning. A pump trips. Somewhere out in the plant, a pipe bangs once — loud enough that the night shift goes quiet and someone calls you.

More often than not, the check valve takes the blame. And a lot of the time, that's exactly where it starts.

Here's the thing about check valves: they're the only valve in the line with no handle. The manual valves around them — gate, butterfly, ball — get turned by hand. A check valve has to react on its own. When flow stops or reverses, the disc has to seat before reverse flow builds up. If it closes slowly, the flow turns around, picks up speed, and then slams the disc shut. That energy doesn't just disappear. It becomes a pressure spike that runs back up the line and lands on the pump, the gaskets, the pipe supports, the instruments. You rarely see it happen once. You see it later — a seal starts weeping, a fitting cracks, and nobody connects it back to a valve that closed a second too late.

So when you're comparing check valves, three details decide whether you get that bang or not.

Close speed. The CSV410 — our stainless steel check valve — uses high torsion Inconel springs to close the plates quickly, before reverse flow has time to build. That's the part that takes the punch out of the slam.

Sealing. Seat faces are lapped for a smooth finish and superior sealing, so the disc isn't dragging across a rough surface every time it closes.

Disc retention. The disc assembly is secured in place by a high strength key. Small part — but on a fast-closing valve, it's the difference between something that cycles for years and something that works loose.

The CSV410 covers NPS 1/2” to 48” (DN15–DN1200) and Class 150 to 1500 (PN10–PN160), with wafer, lug, double fl**ge, dual plate, single plate and threaded versions. It fits a pump discharge in a water treatment plant, an HVAC header, an oil & gas line or a power plant pipeline without you rebuilding the layout around it. For oxygen or chlorine service, we also do special cleaning.

If there's one takeaway: on a line that cycles hard, ask about closing speed and seat finish before you ask about price. Water hammer usually isn't a valve quality problem — it's a valve timing problem.

We build these at EG Valves — a valve manufacturer in Wenzhou, China, making and exporting industrial valves since 2000, with customers in the EU, North America, Latin America and the Middle East.

Curious — when water hammer hits on your site, does it show up first at the pump discharge, or further down the header?

27/09/2026

BOV303 vs BTV305: 3 Butterfly Valve Buyer Checks

Two butterfly valves, one factory, two very different jobs.

If you're weighing EG Valves' BOV303 against the BTV305, put the price column aside for a minute. Three checks do most of the work.

Check 1 — What the design does at the seat.
BOV303 is a triple offset butterfly valve. EG documents two things about it: bubble-tight closure, and elimination of the wear that comes with sealing surface contact. BTV305 is a double eccentric butterfly valve. Its tilted disc releases the compression as it opens, which EG lists as extending durability, and the double eccentric disc design is documented for minimal wear plus good throttling. One is built around tight shutoff. The other is comfortable throttling and still shuts off tight. Know which duty your line actually has.

Check 2 — The documented numbers, and where buyers cross wires.
BOV303 runs NPS 2"–60" (DN50–DN1500), Class 150 / 300 / 600 and PN10 / PN16 / PN25 / PN40. Body: carbon steel, stainless steel, alloy steel, duplex steel. Seat: stainless steel + graphite, or PTFE + stainless steel, with an optional Stellite seat for erosion resistance. Wafer, lug and double fl**ge versions all exist, and you can specify lever, gearbox, worm gear, electric or pneumatic operation.

BTV305 is documented as a double eccentric butterfly valve — that is the design statement. It covers NPS 8"–48" (DN200–DN1200) at Class 125 / Class 150 and PN6 / PN10 / PN16, with ductile iron or carbon steel body and disc, EPDM / NBR / FKM sealing, and a stainless shaft on self-lubricating bearings. Actuation is gearbox, worm gear, electric or pneumatic.

So no, the 60-inch and Class 600 numbers belong to BOV303. Don't carry them across to BTV305 — different design, different documented range.

Check 3 — Service fit.
EG lists BOV303 for oil and petroleum, refineries and tanks, chemical plants, steel mills and shipbuilding. BTV305 is listed for water treatment, HVAC, desalination plants, power generation and municipal water supply. Same brand, different service envelopes, and that usually settles the call faster than the quotation does.

Both models sit inside EG Valves' ISO 9001 and CE PED certificate scope. EG Valves Manufacturing Co., Ltd has been building valves in Wenzhou since 2000.

Which one is closer to your next project — the high-cycle shutoff duty, or a line that needs to throttle?

Address

Sanqiao Industrial Zone, Oubei Town
Wenzhou
325100

Opening Hours

Monday	09:00 - 18:00
Tuesday	09:00 - 18:00
Wednesday	09:00 - 18:00
Thursday	09:00 - 18:00
Friday	09:00 - 18:00

Telephone

+86-577-57992227

Website

https://www.egvalves.com/

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