A practical guide to brass ball, gate, angle, check and float valves for Indian homes — sizes, IS standards, prices and the Aquify range in Indore.
Quick answer
Every home needs full-bore ball valves on the main and on each bathroom branch, angle valves at every geyser, basin and cistern, a float valve in the tank, and a check valve on the pump line.
Last updated: 26 July 2026 · By Puranmal Sons & Ceramix Syndicate, wholesale building-material distributor, Indore · Prices are indicative for mid-2026.
Valves are the switches of your water system. Just as every room in your house has its own electrical switch — so that changing one bulb does not mean turning off the mains — every important water line needs its own valve, so that one leaking tap does not mean a dry house for the whole family.
A valve is simply a metal fitting with a handle. Turn the handle one way, water flows; turn it the other way, water stops. Different jobs need different switches. The main line into your house needs a strong on/off switch that opens fully. The small pipes feeding your geyser, wash basin and toilet cistern need compact switches so a plumber can work on one fixture at a time. Your overhead tank needs an automatic switch that shuts itself when the tank is full, and your pump line needs a one-way gate so water cannot run backwards when the pump stops.
Brass is the preferred metal for all of these because it does not rust like iron and takes threads well.
The verdict in one sentence: every home needs full-bore ball valves on the main and on each bathroom branch, angle valves at every geyser, basin and cistern, a float valve in the tank, and a check valve on the pump line.
| Location / job in the house | Valve to buy | Typical size |
|---|---|---|
| Main municipal/society inlet, after the meter | Full-bore forged brass ball valve | 20 mm (3/4") |
| Overhead tank outlet (down-take line) | Full-bore ball valve | 25 mm (1") |
| Each bathroom branch and kitchen branch | Ball valve (full-bore preferred) | 15–20 mm |
| Geyser inlet, basin hot/cold, cistern connection | CP (chrome-plated) angle valve / stop cock | 15 mm (1/2") |
| Wash area, balcony, garden outdoor tap | Brass bib cock (CP or plain) | 15 mm |
| Concealed bathroom supply inside the wall | Concealed stop valve, CP wall flange | 15–20 mm |
| Pump delivery line (borewell/booster/monoblock) | NRV / check valve (spring or swing type) | 25 mm, matched to pump port |
| Overhead or underground tank inlet | Brass float valve (ball cock) with plastic/copper float | 15–20 mm |
| Old riser isolation in existing buildings | Gate (wheel) valve — replace with ball valve when renewing | 20–25 mm |
| Lower floors of a high-rise (above ~10–12 m head) | Pressure-reducing valve on the down-take | 20–25 mm |
Ball valve. A chrome-plated brass ball with a hole through it sits between two PTFE (Teflon) seat rings. A quarter turn of the lever aligns the hole with the pipe (open) or across it (closed). Quick, positive shut-off, minimal wear — this is today's default isolation valve. Gate valve (the older "wheel valve") lowers a brass wedge across the flow over several turns of a wheel. It gives a full, straight-through bore but the wedge and seat wear if used half-open, and scale in hard water tends to jam the rising spindle. Angle valve / stop cock turns the flow through 90 degrees and closes with a small screw-down piston or quarter-turn cartridge; it is the standard fixture-isolation valve at geysers, basins and cisterns, sold chrome-plated to match bathroom fittings. A bib cock is the same screw-down mechanism ending in an open spout — your utility and garden tap. Check valve (NRV) allows flow in one direction only, using a spring-loaded poppet (vertical or horizontal lines) or a swinging flap (horizontal lines); it protects pumps and prevents tank water draining back. Float valve (ball cock) uses a float on a lever arm to close a small plunger against a seat as the tank fills — the automatic tap that stops your overhead tank from overflowing at 6 a.m.
Good domestic valves are made two ways. Forged brass components are hot-stamped from solid brass rod (European grade CW617N, roughly 57–59% copper, or Indian free-cutting grades under IS 319) and then machined. Forging gives a dense, void-free structure with consistent wall thickness. Cast brass is poured into moulds; it allows complex shapes (gunmetal gate and globe valves under IS 778 are sand-cast) but cheap castings can hide porosity that weeps under pressure.
The bigger issue in the Malwa region is dezincification. Ordinary brass is roughly 60% copper and 40% zinc. In hard, high-TDS, chloride-bearing water — common in Indore-area borewells, where groundwater studies routinely record total hardness well above the BIS desirable limit of 200 mg/l — the water slowly leaches zinc out of the alloy, leaving a weak, porous copper sponge. The valve looks fine outside but crumbles or seizes inside. DZR (dezincification-resistant) brass, typified by grade CW602N with higher copper (~61–63%) and a small arsenic addition, resists this attack. If your supply is borewell or tanker water, ask specifically for DZR or high-copper forged valves; on treated Narmada municipal water, standard CW617N-class forged brass serves well.
Cast the torch on the valve body before you buy. Relevant Indian Standards, each verified against BIS records:
Note that forged brass ball valves are commonly sold on manufacturer specifications (body CW617N or IS 319 grade, PTFE seats, stated PN rating) rather than under a dedicated ISI mark — so for ball valves, judge by weight, brand, material declaration and pressure rating instead of hunting for an ISI logo.
A "15 mm" ball valve is not automatically 15 mm inside. Full-bore valves have a ball passage equal to the pipe bore; reduced-bore valves save brass by using a smaller ball, typically one size down (a 20 mm valve with a ~15 mm passage). On a pressure-fed line that hardly matters, but most Indian homes run on gravity from an overhead tank at barely 0.3–0.6 bar. On a gravity shower or tank down-take, a reduced-bore valve behaves like a permanent half-closed tap — flow drops visibly. Rule of thumb: main lines, down-takes and shower branches get full-bore; a reduced-bore valve is acceptable only where flow is small anyway (a wash-basin spur). Heavier weight for the same size is usually the giveaway that a valve is full-bore.
Never thread a brass male valve directly into a plain plastic female socket. Plastic threads cannot take the wedging force of tapered metal threads and crack — sometimes weeks later, inside a finished wall. The correct method is a brass-insert fitting: a CPVC/UPVC female or male threaded adapter (FTA/MTA) with a moulded-in brass insert. The pipe solvent-cements to the plastic side; the valve threads brass-to-brass into the insert with 4–6 wraps of PTFE tape, tightened hand-tight plus one to one-and-a-half turns with a spanner — not more. For geyser hot lines, keep the CPVC (not UPVC) adapters, and support the valve so its operating torque is not carried by the pipe.
Three things end a brass valve's life: gland leaks (water seeping past the spindle/stem — usually curable by snugging the gland nut a quarter turn or re-packing), seat wear (the valve no longer closes drip-tight — ball valves resist this far better than gate valves), and hard-water seizing (scale locks a spindle that has not moved in years). The single best habit costs nothing: exercise every valve twice a year — close it fully, open it fully, twice. A quality forged brass ball valve so treated routinely gives 10–15 years of service; a seized valve discovered during a burst-pipe emergency is worth nothing at the moment you need it most.
1. Complete valve schedule for a 2BHK Indore flat (2 bathrooms, kitchen, wash balcony). One 20 mm full-bore ball valve at the society inlet; one 25 mm full-bore ball valve on the overhead-tank down-take; three 20 mm ball valves on the two bathroom branches and the kitchen/utility branch; eight 15 mm CP angle valves (two geyser inlets, two per basin, one per cistern); three 15 mm bib cocks (wash area, balcony, service tap); one 20 mm float valve on the tank inlet; one 25 mm NRV on the booster-pump line. That is 17 valves. At branded/ISI-quality trade prices this totals roughly ₹6,500–8,500 — typically under 2% of even a modest bathroom renovation budget, protecting the entire installation.
2. Borewell bungalow near Rau: bazaar valve vs DZR. On borewell water testing around 500–600 mg/l hardness, a ₹140 zinc-heavy "brass" ball valve on the pump line dezincified and seized inside 2 years — cost of failure: ₹150 replacement, ₹500 plumber visit, half a day without water, i.e. about ₹400 per year of service. A ₹350–450 DZR/high-copper forged valve lasting a conservative 10–12 years works out to ₹30–40 per year. The costlier valve is roughly 10 times cheaper per year of service.
3. Repairing one bathroom without shutting the house. A leaking concealed diverter normally means draining the line. With a 20 mm branch ball valve outside the bathroom, the plumber closes one lever; the kitchen, second bathroom and tank stay live for the two days the wall is open. Without it, the only shut-off is the tank outlet — the whole flat goes dry, and a family of four typically hauls 60–80 litres of water in buckets per day of repair. One ₹300 valve, fitted at construction, is the difference.
Puranmal Sons & Ceramix Syndicate is the authorized distributor for Aquify domestic brass valves in the Indore region, stocking the brand alongside its Indiano and Qinn (Valvco International) metallic valve lines. The Aquify range covers the everyday domestic requirement discussed in this guide: forged brass ball valves, CP angle valves, bib cocks, non-return valves and float valves in the standard 15 mm, 20 mm and 25 mm household sizes with BSP threading, suitable for GI lines and for CPVC/UPVC systems via brass-insert adapters. Specific range details — pressure class PN 10 to PN 25, bore type by model, finish options CP/natural brass and warranty with piece-to-piece replacement — are available at the counter, and we recommend confirming the exact model against your water source (municipal vs borewell) and line size. As distributor stock moves in trade quantities, plumbers, contractors and builders can obtain project pricing on full valve schedules, and individual retail customers are equally welcome to buy single pieces with guidance on selection.
Prices below are indicative, mid-2026, may vary by brand, city and quantity; drawn from current trade listings.
| Valve (size) | Bazaar-grade / unmarked (₹) | Branded / ISI-marked forged (₹) |
|---|---|---|
| Ball valve, 15 mm | 120–180 | 200–350 |
| Ball valve, 20 mm | 150–250 | 250–450 |
| Ball valve, 25 mm | 200–350 | 350–650 |
| CP angle valve, 15 mm | 150–250 | 300–600 |
| Bib cock, 15 mm (CP, IS 8931 class) | 150–300 | 350–800 |
| Concealed stop valve, 15–20 mm | 250–400 | 450–900 |
| Float valve (ball cock), 15–20 mm | 250–450 | 450–900 |
| NRV / check valve, 20–25 mm | 200–350 | 350–800 |
| Gate (wheel) valve, 20–25 mm | 250–400 | 400–900 (IS 778 gunmetal higher) |
The cost logic is simple: across a full 2BHK schedule, the difference between bazaar-grade and branded/ISI-marked stock is roughly ₹2,500–3,500 in total — less than one plumber call-out plus one tile-cutting repair. Unmarked valves save money precisely where failure is most expensive: inside walls and on lines that run unattended. Buy the marked product for anything concealed, anything on the main line, and anything touching borewell water; economise, if at all, only on exposed, easily replaced positions.
No isolation valve per bathroom. One leaking fixture then shuts down the entire house for the duration of the repair, and families postpone small leaks until they become big ones. Fit a ball valve on every bathroom and kitchen branch at construction — retrofitting later costs 5–10 times as much in chasing and tiling.
Threading brass directly into plain plastic fittings. Tapered metal threads wedge plastic sockets apart; the crack often appears weeks later inside a finished wall. Always use CPVC/UPVC adapters with moulded brass inserts, PTFE tape, and stop at hand-tight plus about one turn.
A reduced-bore valve on a gravity shower or down-take line. At tank pressures of 0.3–0.6 bar, the smaller ball passage throttles flow like a half-closed tap and the shower turns to a trickle. Specify full-bore for mains, down-takes and shower branches; check by weight and by looking through the open bore.
Buying cheap zinc-heavy "brass" on hard water. High-zinc alloys dezincify in high-TDS borewell water and can seize or crumble within 2–3 years, often failing closed when you need them open. On borewell or tanker supply, pay for DZR or high-copper forged brass — the per-year cost is a fraction of the cheap valve's.
Never operating the valves. A valve untouched for five years is frequently scale-bound exactly when a pipe bursts at night. Exercise every valve — full close, full open, twice — every six months; it takes two minutes for the whole house.
Using a gate valve where a ball valve belongs. Gate valves left half-open chatter and wear their seats, and their rising spindles jam with scale. Keep gate valves only where they already exist and work; standardise new isolation points on quarter-turn ball valves.
A full-bore forged brass ball valve, 20 mm for most flats and 25 mm for the overhead-tank down-take of an independent house. It closes in a quarter turn, seals drip-tight for years, and does not restrict gravity flow the way a reduced-bore or worn gate valve does.
For new work, the ball valve wins on every domestic count: faster shut-off, better sealing over time, and far less prone to hard-water jamming. The gate valve's one advantage — very gradual closure that avoids water hammer on long pump lines — rarely matters at household sizes; existing gate valves that still work can simply be left in place.
That is a gland leak: water creeping past the spindle packing, not a failed valve. Tighten the gland nut under the handle a quarter turn; if it still weeps, the packing or O-ring needs replacement — a ₹20 part on most screw-down valves, while quality ball valves use O-rings that seldom fail.
They are nominal bore sizes matching pipe sizes: 15 mm = 1/2", 20 mm = 3/4", 25 mm = 1". Threads on standard Indian valves are BSP per IS 554, so a 15 mm valve fits any standard 1/2" GI thread or CPVC brass-insert adapter.
Yes — via a brass-insert threaded adapter solvent-cemented to the pipe, never by threading into plain plastic. Use PTFE tape on the threads and moderate tightening; for hot-water (geyser) lines, use CPVC adapters rated for the temperature.
Brass does not rust like iron, but ordinary brass can dezincify in hard, high-TDS borewell water, weakening from within. On municipal water a good forged valve lasts 10–15 years; on hard borewell water, choose DZR/high-copper brass and exercise the valve twice a year to reach a similar life.
Only if your incoming pressure is high — typically lower floors of buildings above roughly four storeys, or pumped/hydro-pneumatic systems. Symptoms are banging pipes, spraying taps and short-lived float valves; a 20–25 mm PRV on the down-take protects the whole floor.
Standards cited (all verified against Bureau of Indian Standards records):
Sources used:
Puranmal Sons & Ceramix Syndicate is the authorized distributor for Aquify domestic brass valves in the Indore region, stocked alongside our Prince and Astral pipe ranges, Indiano and Qinn valves, water tanks, tiles and sanitaryware. With over 40 years on Jawahar Marg, we supply plumbers, contractors, builders and homeowners across Indore, Dewas, Ujjain, Pithampur, Dhar and Mhow. Trade and project enquiries are welcome — bring your valve schedule and we will price it line by line. Call 95222-20983 or visit us at 254, Jawahar Marg, Rajmohalla, Indore.
Share your list or BOQ and we'll call back with pricing and availability, usually the same working day.
