Front view of Huiya heavy-duty PPH pneumatic true union valve. The robust structure withstands harsh industrial chemical environments

PPH Pneumatic True Union Ball Valve

Q: Q: Why choose PPH over CPVC or PVDF for my valve?

For hot caustic and alkaline media, PPH outperforms both — and costs less. CPVC is the choice for hot acids and chlorinated media; PVDF for strong acids and solvents; PPH for hot alkalis. Tell us your media and we'll confirm the right one.

Q: Q: What is the maximum temperature for a PPH ball valve?

85°C (185°F) for continuous service. For hot caustic specifically, PPH holds up where chlorinated plastics fail.

Q: Q: Can I service this valve without cutting the pipe?

Yes — loosen the two union nuts, slide the valve body out, service or replace the ball/seats/O-rings, and reconnect. No pipe cutting, ideal for scaling or crystallizing media that need regular cleaning.

Q: Q: What end connections are available?

Socket fusion or butt fusion, DIN metric standard.

Q: Q: Can this valve handle sodium hypochlorite?

No — sodium hypochlorite is a strong oxidizer that attacks PPH. Use a CPVC or PVDF valve for hypochlorite. We supply both.

Q: Q: Is it full port?

Yes, full port (full bore) — the bore matches the pipe ID, minimizing pressure drop and easing cleaning.

The Huiya PPH pneumatic ball valve is a true union, full-port automated valve engineered for hot alkaline and corrosive fluids — the applications where PVC, CPVC, and even PVDF reach their limits. Built from polypropylene homopolymer (PPH) and rated to 85°C, it is the material of choice for caustic soda, ammonia, dilute acids, and chemical dosing lines. The true union design lets you service the valve without cutting into your pipework.

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Why PPH for Alkaline Service

Material selection for valves is about matching the polymer to the chemistry — and alkalis are where PPH excels. CPVC and PVC are excellent for hot acids and chlorinated media, but they are not suited to strong hot caustic. PVDF dominates strong acids and solvents, but degrades in hot concentrated alkali. PPH is the specialist for hot alkaline duty, handling sodium hydroxide up to 50% concentration at elevated temperature where chlorinated and fluorinated plastics fail.

This isn’t about one material being “better” — it’s about using the right material for the chemistry. For hot caustic, ammonia, and many organic acids, PPH delivers the longest service life at the lowest cost.

Best-fit applications:

Hot alkaline environments (caustic soda, KOH) up to 85°C

Chemical dosing on scaling or crystallizing media (easy true-union cleaning)

Cost-effective alternative where 316L stainless or titanium corrodes

Ammonia, dilute-to-mid acids, salt solutions

Service Without Cutting Pipes

In scaling or crystallizing media, valves need frequent cleaning. The true union design lets operators simply unscrew the two union nuts and slide the valve body out for cleaning or service — without cutting the pipe or waiting for fusion joints to cool. The ball, PTFE seats, stem, and O-rings can each be inspected or replaced individually.

Field story — why material choice matters (textile dyeing plant, Shanghai): A dyeing plant needed to discharge 80°C sodium hydroxide wastewater at 30% concentration. Knowing UPVC couldn’t handle 80°C, the engineering lead invested in CPVC valves rated to 93°C. Within six months the valves became hard to operate, with minor weeping at the flange root. The cause: CPVC is outstanding for hot acids, but hot strong caustic attacks chlorinated plastics — the body had softened and swelled. The fix was to switch to PPH, the specialist for hot alkali, which has handled the 30% caustic at temperature ever since — at a lower cost than the CPVC it replaced. The lesson: CPVC for hot acid, PPH for hot caustic. Right material, right place.

PPH true union ball valve body featuring an ISO 5211 high mounting pad, ready for direct installation of pneumatic or electric actuators.

Technical Specifications

Specification	Detail
Valve Type	True union, full-port pneumatic ball valve
Body Material	PPH (polypropylene homopolymer)
Size Range	DN15–DN100 (1/2″–4″)
Bore	Full port
Pressure Rating	PN10 (1.0 MPa) at ambient temperature
Max. Temperature	85°C (185°F)
End Connections	Socket fusion or butt fusion, DIN metric
Ball	PPH
Seats	PTFE
O-Rings / Seals	EPDM or FKM (selected by media)
Actuator	Pneumatic, double-acting or spring-return, aluminum alloy

Dimensions

Size	d	l	d1				d2
Size	d	l	DIN	JIS	ANSI	CNS	DIN	JIS	ANSI	CNS
1/2″ (DN15)	15	23.00	20.28	22.35	21.54	22.35	19.95	21.75	21.25	21.75
3/4″ (DN20)	20	26.00	25.30	26.40	26.87	26.40	24.95	25.70	26.58	25.70
1″ (DN25)	25	29.00	32.30	32.40	33.65	34.50	31.95	31.70	33.28	33.90
1-1/4″ (DN32)	32	32.50	40.35	38.45	42.40	42.50	39.95	37.65	42.05	41.90
1-1/2″ (DN40)	40	35.50	50.35	48.45	48.50	48.45	49.95	47.65	48.12	47.65
2″ (DN50)	50	38.50	63.40	60.50	60.60	60.50	62.90	59.60	60.18	59.60
2-1/2″ (DN65)	63	44.50	75.40	76.50	73.35	76.50	74.90	75.60	72.85	75.60
3″ (DN80)	75	51.00	90.45	89.60	89.30	89.60	89.90	88.60	88.70	88.60
4″ (DN100)	90	61.50	110.45	114.50	114.75	114.60	109.90	113.60	114.10	113.60

All dimensions in mm. Socket connections available in DIN, JIS, ANSI, and CNS standards. d = nominal size, l = socket depth, d1/d2 = socket diameters.

Size	D	D1	L	L1	L2	H	H2
1/2″ (DN15)	56.0	32.0	112.0	66.0	57.0	162.0	28.7
3/4″ (DN20)	65.0	37.0	120.0	68.0	59.0	174.0	32.7
1″ (DN25)	76.0	45.5	136.0	68.0	—	208.0	38.75
1-1/4″ (DN32)	87.0	55.5	150.5	85.0	76.0	214.0	44.25
1-1/2″ (DN40)	101.0	62.0	168.0	95.5	86.5	237.0	51.5
2″ (DN50)	121.0	79.0	180.0	103.0	92.0	258.0	62.0
2-1/2″ (DN65)	150.0	94.2	235.0	146.0	134.0	310.0	79.5
3″ (DN80)	169.5	113.0	265.0	163.0	148.0	341.0	90.0
4″ (DN100)	190.0	135.0	304.0	181.0	157.0	379.0	96.0

All dimensions in mm. D = body diameter, L = end-to-end length, H = overall height with actuator. Full dimensional drawings available on request.

PPH pneumatic true union ball Technical Data Sheet 下载

Actuator Torque Requirements

Size	DN15	DN20	DN25	DN32	DN40	DN50	DN65	DN80	DN100
Torque (N·m)	6	8	10	12	15	20	40	45	65

Break torque values for actuator sizing. Add a safety factor when selecting the actuator; our engineering team can recommend the correct actuator for your operating pressure.

Chemical Compatibility

PPH’s strength is alkaline and organic-acid resistance:

Excellent for:

Sodium hydroxide (caustic soda) up to 50% concentration, even at elevated temperature

Ammonia / ammonia water

Hydrochloric acid (standard concentrations)

Sulfuric acid (low-to-mid concentration, typically <50%)

Organic acids (acetic, lactic) and most salt solutions

Not recommended: sodium hypochlorite (bleach), chlorine gas, chlorine water, bromine water, hydrogen peroxide and other strong oxidizers; aromatic hydrocarbons (benzene, toluene); chlorinated solvents. For oxidizers and chlorinated media, a CPVC or PVDF valve is the correct choice — contact our engineering team.

Applications

Chemical dosing — caustic and dilute-acid dosing lines

Electroplating & surface finishing — alkaline and acidic process baths

Semiconductor — chemical supply (non-ultrapure)

Wastewater treatment — alkaline effluent, pH control

Real projects: Huiya supplied 82× DN25 single-acting PPH pneumatic ball valves for an amino-acid production line in Hebei, China; and 120× DN50 double-acting PPH ball valves (with explosion-proof air-prep units) for a new-energy project in Indonesia.

Quality & Reliability

High-temperature hydrostatic test: 90°C, held at PN6 (6 bar) for 1,000 hours — no creep deformation, zero leakage at flange root and union nuts

Actuated cycle life: 100,000+ cycles (6 bar air drive, 10 bar internal water) — CNC-machined ball shows no scoring, PTFE seat wear under 0.1 mm

Burst pressure: critical point at 4.2 MPa (42 bar) at ambient — evidence of high injection-molding density

Design service life: up to 25 years under standard operating conditions; reduces predictably at continuous max temperature

Every unit pressure-tested and seal-tested before shipment

PPH is built for hot alkalis — but if your line carries hot acids, chlorinated water or concentrated acids instead, the same valve is available in CPVC, PVC and PVDF. For high-pressure or large-bore service, choose the PPH flanged ball valve; for cost-effective large-diameter isolation, the PPH butterfly valve. Tell us your media and temperature and we’ll confirm the right material — Material Selection Service. View all PPH valves.

Engineering Notes & Common Mistakes

Union nuts loosening under thermal cycling. On lines that swing daily from 20°C to 85°C, thermal expansion can slowly loosen plastic union nuts and cause weeping. Re-tighten nuts periodically by hand on such lines — or for critical, unattended high-temperature service, choose our one-piece flanged ball valve instead.

Moisture entering the actuator exhaust. In humid or acid-mist plant environments, fit a silencer/muffler on the actuator exhaust port. It reduces noise and, more importantly, stops corrosive mist being drawn into the cylinder where it corrodes the spring.

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Frequently Asked Questions

Q: Why choose PPH over CPVC or PVDF for my valve?

For hot caustic and alkaline media, PPH outperforms both — and costs less. CPVC is the choice for hot acids and chlorinated media; PVDF for strong acids and solvents; PPH for hot alkalis. Tell us your media and we’ll confirm the right one.

Q: What is the maximum temperature for a PPH ball valve?

85°C (185°F) for continuous service. For hot caustic specifically, PPH holds up where chlorinated plastics fail.

Q: Can I service this valve without cutting the pipe?

Yes — loosen the two union nuts, slide the valve body out, service or replace the ball/seats/O-rings, and reconnect. No pipe cutting, ideal for scaling or crystallizing media that need regular cleaning.

Q: What end connections are available?

Socket fusion or butt fusion, DIN metric standard.

Q: Can this valve handle sodium hypochlorite?

No — sodium hypochlorite is a strong oxidizer that attacks PPH. Use a CPVC or PVDF valve for hypochlorite. We supply both.

Q: Is it full port?

Yes, full port (full bore) — the bore matches the pipe ID, minimizing pressure drop and easing cleaning.

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