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Hydraulic Test Pump: Brass Valve Box with Glass Marble Valves and a Gas-Barrel Plunger (Cassell's, 1903)

P. N. Hasluck (ed.) · Public domain

أنشأه

Forge

9. نوفمبر 2026

Hydraulic Test Pump: Brass Valve Box with Glass Marble Valves and a Gas-Barrel Plunger (Cassell's, 1903)

A hand pump for testing a small boiler, a pipe or a fitting with water under pressure. Cassell's Cyclopaedia of Mechanics (1903) drills a brass rod into a valve box, uses two glass playing marbles as the valves, and works a plunger in a short length of gas or steam pipe through a gland made from an ordinary socket and nipple. The source says it "would stand a pressure of 250 lb. per square inch easily". It has no gauge of its own: read the pressure on the work being tested. Source: P. N. Hasluck (ed.), Cassell's Cyclopaedia of Mechanics, Third Series (1903), p. 291, "Simple Hydraulic Testing Pump". Picture: its Figs. 1-3.

متوسط

Unknown

التعليمات

Read Cassell's

"The pump here illustrated is designed for use in testing a small boiler, and for similar purposes; it will fulfil the purpose of pumps of costly design and workmanship, and can be built for a few pence. It consists of a rod of solid brass or gun-metal drilled out to the required sizes as shown in Fig. 1, and fitted with ordinary iron gas or steam bends at the top and bottom of valve box."

Drill the valve box

Drill a rod of solid brass (or gun-metal) lengthwise from both ends to the sizes in Fig. 1, so that each glass marble drops into a seating made by the drill: the suction valve below, the discharge valve above. Drill and tap both ends for the iron gas or steam pipe bends, and drill and tap the centre of the side to take the pump barrel. No sizes are given (unknown).

المواد لهذه الخطوة:

قضيب نحاس أصفر1 valve box

الأدوات المطلوبة:

ملزمة منضدة

مثقاب عمودي

طقم لقم ثقب

طقم أدوات قطع اللولب

أبعاد غير معروفة

Fit the valves and bends

Drop a glass marble into each seating (glass is preferred: it is far rounder than clay marbles). Screw an iron gas or steam pipe bend into the bottom (the suction) and another into the top (the delivery). The upper pipe carries a small cross-bar that stops the discharge marble from blocking the outlet (Fig. 3); its material is not given (unknown).

المواد لهذه الخطوة:

كرات زجاجية2 قطع

وصلة أنابيب ملولبة2 pipe bends

مادة غير معروفة1 cross-bar

الأدوات المطلوبة:

مفتاح مواسير

Make the barrel and gland

Cut a short length of gas or steam pipe for the barrel: its length is set by the stroke the pump is to have. Screw one end into the valve box. Countersink the other (gland) end, screw an ordinary socket over it, and screw into the socket an ordinary nipple, also countersunk, as the gland. Fit a back nut on the nipple for screwing up the gland and fix it with a rivet so it cannot turn.

المواد لهذه الخطوة:

أنبوب ماء1 short length

وصلة أنابيب ملولبة2 socket and nipple

صامولة قفل1 قطعة

برشام حديد1 قطعة

الأدوات المطلوبة:

منشار حديد

طقم لقم تجويف مخروطي

مفتاح مواسير

مطرقة كروية الرأس

Make the plunger

File out the inside of the barrel roughly to remove scale and unevenness left by the pipe mandrel. Turn a plunger to fit it loosely, file two flats on one end and drill a hole there for a pin. The plunger's material and what the pin holds are not given (unknown).

المواد لهذه الخطوة:

مادة غير معروفة1 plunger

الأدوات المطلوبة:

مبارد (مبرد يدوي)

مخرطة معادن

مثقاب عمودي

طقم لقم ثقب

Mount and use

Fix the pump down with two ordinary bent clips over the barrel near its ends (Fig. 2). Put the suction bend in water, connect the delivery to the work and work the plunger. Cassell's: the pump "would stand a pressure of 250 lb. per square inch easily". The clip material is not given (unknown).

المواد لهذه الخطوة:

مادة غير معروفة2 bent clips

الأدوات المطلوبة:

مفتاح مواسير